"If someone wants to sleep in the park and drink his social security money, who is to say that this is wrong?"

The assertion that they want to live this way is a standard argument made by the right to avoid taking any responsibility for their fellow citizens.  While their are many caring and professional people working in it, the mental health industry itself is just a step above the prison guards at Abu Graib, IMO, but I've been through it and I've known the people who are dumped on the streets, and I can tell you, this is not how they want to live.  What they want is dignity.  

Those who can make you believe absurdities can make you commit atrocities. -Voltaire