Perhaps these Meds helped take their behavior to the next level.
Oh, I think they can. As I understand it, SSRI's make a person not care about things that bother them. The hope would be that whatever is depressing the individual would cease to do so as the drugs give them a "whatever" attitude about their problems. However, I wonder if these drugs in high dosages can make a person so numb to feelings that it makes it easy for them to kill dispassionately.