I'm very interested to hear others' personal experiences of types gone bad, not just had bad form in that particular intance, but completely off their rocker, gone bad. There are a lot others, I'm 90% I'm right on, that are famous or historical characters but I don't know them personally, so I'll refrain, for this thread.
I know any type can go bad, but the only one I have trouble imagining is the INFJ. I could see them killing themselves, but not hurting others. When I think of go bad, I take it as first and foremost fucking over other people. They probably do exist, but that is the only, I can't picture.
Quenk has a book about what specific types will do when they are stressed but that's different, since normal healthy individuals can exhibit those traits. I took "gone bad", to mean bordeline sociapathic/schizoid/fill in the blank, need to call in a pyschiatrist for serious help, gone bad