dismembers post I think is right on the money!
About 10 years ago, I was briefly put on effexor for mild depression. I am one of the most passive / nonviolent and non tempermental people anyone could know. Never blown up or anything. After a week I felt a weird change, that I was getting very aggressive and just the slightest tiniest thing a person could do could make me blow up on them and possibly physically attack them. I immediately cold turkeyed that stuff and stayed home until it was out of my system and I was back to normal. Years later I looked it up and saw many horror stories about that stuff.
Then I know other people personally who doctors just put them on anything and guinea pig them, for even minor things which could be treated alternatively. They then become depedenant on them and if they try to stop the medication, they may have had very minor mental issues or just depression, then suddenly it's much much worse.
Aside from that, imagine, like in the case of wellbrutin, where the past several years the drug was made incorrectly and it had not been working, if you have thousands/hundreds of thousands of people on some of these more dangerous withdrawal and side effect mental medications that begin within a few days of withdrawal, if the drug company screws up and the batches are not made correctly, then you have thousands of walking time bombs all over the place, who have guns they bought to protect themselves and their familes, which they are now a danger to all around them.