The equipment is perfectly legal in literally every single country on the earth except Cuba and a few other hold-outs
I addressed this in my original post in this thread, naively thinking that you were being honest. Did you fail to read it, or was I too naive? He was not a private citizen smuggling in some satellite dishes for himself or his family. He was acting on the behest of the very country that prohibits the sale and export of the same equipments and services to Cubans. That is a key difference, perhaps not legally, but ethically, that points to the intent behind his actions: not private consumption, but subversion. He wasn't convicted (solely?) because of the illegal contraband, he was convicted for his actions (including the smuggling) as a US mercenary---the contraband was evidence against him.
Legally speaking they only had him on the charges of smuggling. Cuba has no sovereignty over the CIA's plans, so it has no right to challenge those plans in Civil Court.
Your argument is that no President has ever explicitly offered to raise the embargo. That is literally true, but it completely ignores how reality works. (...) President Obama does not have the authority to totally lift the embargo on Cuba. (...) So he tried it, and the Cubans responded by increasing tensions to the max possible at literally the very first opportunity.
The Cubans responded? President Obama sent Gross to Cuba before the Cubans arrested Gross. At no point, it seems, President Obama stopped trying to increase the tensions himself (by expanding US subversive programs in Cuba, before, during and after Gross' trial).
International relations is about relationships. It's iterative, not a series of one-off encounters,
Let's use a romance metaphor. Let's say you had a major tiff with your wife and she threw you out. Then she let you move back in and sleep on the couch. If you actually want to get all the way back into her bedroom you'd better be careful about how you handle any new conflict that appears or you'll scupper your chances at getting back together. For example, if she insists you let her dog out every 30 minutes overnight because little Poopsiekins poops a lot that's clearly unreasonable, and you would ordinarily be justified in responding with a hearty "Hell no you controlling bitch, deal with your own damn dog." But if you actually want to get back into her bed you'd better do something different.
The US-Cuba relationship (or the Syria-Lebanon relationship, or any other pair you care to mention) works just the same way. They went Communist in the late 50s for reasons that made sense to them. We really didn't like that, so we downgraded our official relationship to nothing and made it illegal for them to do business with any of our people (embargo). Since then whenever we start to thaw out the relationship they make sure that they take a precedent-setting America-annoying position during the next conflict.
Partly this is due to the complex legal construct called "sovereignty,"
Sovereignty goes both way. You refuse to accept Cuba's sovereignty. The US may carve whatever exceptions they'd like on how to deal with their prisoners (you seem to have constructed a very narrow and arbitrary set of exceptions to support your case), but Cuba has no obligation to do the same.
They have 100% sovereignty over their stuff. We have 0% sovereignty over their stuff. There are some places where it gets complicated (ie: Guantanamo), but in general it's pretty clear. Our Agents are clearly our stuff.
As for whether I'm being "narrow and arbitrary," I challenge you to name a single intelligence officer of any state, who was imprisoned for several years by another state, for a crime that didn't involve human rights violations. I'm sure somebody, somewhere, in the history of the world has done it. But damned if I can think of an example.
the problem for you is not the individual guy they sent to your shores, it's that a government with thousands of more agents wants to fuck with you.
Indeed. Therefore, ideally, the Cubans should be trying to extract consessions from the US, because deterring the US government is far more preferable than deterring individual agents. But alas, the US refuses to negotiate in any meaningful way. That's their prerogative, but it leaves the Cubans with no choice but to hold Gross as a (minor) deterrent for future agents. To do otherwise is the same as announcing that CIA agents can work in Cuba with impunity.
This isn't a computer game, where your choices are limited to things the game designer thought of.
The standard response to these things is actually more effective at deterrence, while doing less long-term harm to the relationship with the other country. You arrest the agent. You may even charge the agent. but you start immediate negotiations for the freedom of said agent. This has the advantage that a) it generally wrings a concession of some kind in the short term, b) in ensures the hostile state's intelligence services know they have to be more careful in sending their guys in, and c) in ensures that we're not talking about imprisoned Agent X years later. You will note that Cuba failed to get a) with it's strategy, and we are indeed talking about Gross years later.
now they have another reason to be really pissed off.
They are already pissed off, and either unwilling or unable to change things. You seem to be unable to grasp the relation between cause and effect and the direction of time. Gross is not a reason relations have not improved (as proven by the many years of non improvement before he was ever arrested), he is merely the latest excuse. He is also a convenient scapegoat to claim, with no regard for logic or reason, that the Castros are the ones who want the embargo. There is zero evidence to suggest that an unconditional release will improve relations (and a lot of evidence against it, some of it provided by yourself).
To quote myself:
"If you want to get something big in international relations you reduce tensions, that means when the other side does something that fills you with righteous indignation you do your best to ignore it. In Gross's case that would have been a simple arrest, perhaps followed immediately by negotiations to free the Cuban Five (the arrest was in Dec. '09, followed by years of nothing, a trial starting in Feb. of '11, and then the offer to swap in May of '12)."
I thought that was pretty clear. I've never said anything about an unconditional release.