The real irony here is the original justification of outlawing pot in the first place. "Gateway drug" to harder stuff was the original argument.
Here we are some years on and we can review and see that even if that theory was good (it's not), the price we pay to draw that line in the sand is way too high. I can grow coffee plants on my own land for noncommercial purposes that have more dangerous effect, and yet we're willing to let people break down your door, shoot your dog, and give your whole family PTSD you just might need drugs to help with, if only there was a miracle crop that could safely reduce anxiety... (seriously, have you *seen* the list of uses hemp has? The original US Constitution document was written on hemp parchment, among many other things)... oh, look at that house of cards collapse. Intent is a pretty stupid thing to consider without speaking to some more serious crime (i.e. first degree murder vs. manslaughter). I'm not saying you're wrong, but you really shouldn't be right in a just world.
Honestly, there's no moral theory that makes the law reasonable, particularly given how racist the enforcement tends to be, now that we have actual data on how the "war on drugs" is prosecuted. We'd save a boatload on prison spending if we legalized it across the board, to say nothing of restoring the actual freedom politicians like to reference but have gone AWOL in the last few decades, and maybe give the US some of its international dignity back.