Having dealt with those issues for many years, and recovered, I can see a real danger in those who suffer from depression saying "K will fix this? I'll try anything". I would have.
I'm a firm believer in drug law reform and decriminalization of drug use but from what I've seen of it Ketamine isn't something you want people taking out of desperation, with little knowledge of how crazy it just might get. Or worse, developing a dependency on. It's pretty serious stuff.