We hear this again and again. Families can't convince their loved ones to get help. This is why state hospitals are necessary.
Schizophrenics are particularly hard to help. They will agree to take their meds and other requests from a family member, and do it for a while, just to stop complying and descend back into their madness.
Most of them are harmless, except to themselves, but their loony talk can be pretty scary.