Respectfully, as someone who suffers from mental illness, I think you should perhaps be careful you're not lumping all disabled people in together. "Crazy" really isn't a word that's analogous to "cripple" or "gimp", even if some people don't like it, and it's really part of a different discussion than the one you're trying to have here. If you want to have that discussion, cool, but have it, don't just throw it in as an afterthought when you're talking about something else.