To start off, your carefully quoted list of rebuttals is so littered with misrepresentations and ignorance that I suspect it would make someone either (1) acquainted with the reality of the deployment and employment of nuclear weapons, or (2) trained in a nuclear science or engineering ... just make their head explode.
Those weapons have to be decommissioned at some point anyways, therefore if you engage in policies which dictate any maintenance fees be incurred, it is more expensive to keep them. This is obvious on its face, and arguing with this point can only be incredibly ignorant or disingenuous.
Most of the cost of maintaining nuclear weapons has nothing to do with military payroll, but costs incurred by in the maintenance of peripheral force structures necessary to support the force in the pre- and post-SIOP environment. The US strategic defense system is the most expensive and reliable engineered construct devised by man. DOD carves out a very large chunk of the nuclear pie, but it is not the majority, and the bulk of it goes to support forces which are single-purpose nuclear war fighters. So in the event force reductions made certain squadrons redundant, most of those jobs would go away.
Can you city any mathematical proof which states that it is safer for you and your greatest enemy to horde innumerable cataclysmic weapons? I suspect you can't, and you can name-drop conservative think tanks till you are blue in the face, but that doesn't change the fact that those studies chiefly concern weapons employment and using mathematics to ensure that the use of constrained resources such as warheads are optimal.
Also, neither the Brookings Institute nor the Santa Fe Institute did any foundational work on MAD, only retrospective analysis, which, in the context of the fact that billions of dollars of recurring contracts are wrapped up in the enterprise, is hardly surprising considering the amount of money laying around to throw to those willing to write for the purpose of supporting the current budget.
You proceed with a laundry list of useless strawmen that has nothing to do with the benefits of nuclear force reductions. What in the world does closing Gitmo have to do with the logic of nuclear force reductions?
Nuclear weapons materials fuel almost half of all reactors in the United States, whether it is Plutonium-based MOX or HEU going into naval reactors.
Commercial power reactors, in fact, start with a low-enriched Uranium fuel load, and convert a significant portion of the 238U into Plutonium, which is then fissioned and the energy converted. BWR fuel cycle leverages this more than PWR, but both would be completely uneconomical without the existence of this conversion. Also, for this reason, commercial reactors can, and have, been fueled with ex-weapon plutonium and uranium.
The plutonium that RTG's use is NOT the same plutonium as in weapons.