I have first heard of Terry Davis on HN. I am not American, so I couldn't probably do much. A lot of comments blame mental illness etc, whereas IMO, his condition being well known, an otherwise talented person like him should have been more taken care of by his relatives and anyone who was in capacity to recognize his good parts. So much people knew about him and him being so unique I thought someone would support him somehow.
He was supported by his family. I'm sure you understand that receiving support doesn't make mental illness disappear. And in the US, no one can force him to take meds unless it's proven in court that he is going to harm himself or others.