He's got rich parents who don't have to spend any of their money keeping the freak in good digs.
If you have ever noticed, his parents officially support him, but they sure as hell act like they want nothing to do with him like he is a burden.
Kind of like a "my son is a worthless crackhead and piece of garbage, but he is our son and we love him for who he is even though we think he is crap".
Listening to his family (especially his brother) you get the feeling they feel obligated to spend money to help him, but don't want him anywhere outside of a hospital.
The Leftwing kooks try to make a conspiracy theory out of the fact that his family and the Bush family are actually friends and are pretty close.
I think the media played down the fact that he was a disturbed nut who was rebelling more against his family, and played up his sick obsession with Jodie Foster (they also totally ignored he fact that he was a one time neo-nazi and socialist with homicidal urges).