"I'm going to go out on a limb here and suggest the underlying problem might not be the antipsychotics".
See the problem with your phrasing?
Lots of people deal with anxiety, anger management, and other relatively mild psychological malfunctions by self-medicating (or prescription medicating) with THC. That's why it gets prescribed as medication for these things. THC is effective in many cases, with very few side effects, relative to other medications.
I have friends who are "marijuana addicts", who are pretty horrible to be around when they're not stoned, but fine when they are. They can be social and do their jobs. So, um, what's wrong with that? I am quite happy for them.
edit: I should add that there's this Puritan tendency to treat things like anger management issues as a moral failing rather than a medical problem. So medicating rather than moralizing is seen as a character flaw. Personally, I deal with ADD. I've been formally diagnosed, and it's measurable and measured. I don't medicate for it and I pay a price for that - it puts limits on my activities and decisions, to shield my life from the problems ADD can cause. I don't medicate because the medication has caused side effects that were worse than the condition, for me. If I thought THC would help me deal with my ADD (it doesn't), I'd be out fighting for a prescription.