Paranoia is one characteristic of schizophrenia, which primarily (though not exclusively) hits young males between their mid-teens and mid-twenties. Although most schizophrenics are not necessarily violent, it would not be difficult to exacerbate the paranoia of a schizophrenic and encourage them to do heinous acts.
I am aware of that, but this guy was saying that the government was programming him. May be he has mental problems, but....that makes him the kind of person who can be easily manipulated in various ways.
None of us know this for a fact, but we have heard of mind control and it would be naive to think governments do not engage in it, or experiment with it.