A third possibility for T1 is that HIS behavior is compulsive and unconscious, meaning his reasons for continuing can't be categorized.

I think the bottom line is to get away from immediate harmful situations and to look at the "why" of it at leisure. A couple of catty women are part of a non-therapy group I'm in. Both women have actually sought me out to inflict nasty words and gestures, likely to impart they're the new Queen Bees in town. Admittedly I obsess on their nastiness which often whirls in my head. (Knowing the "why" doesn't help.) But outside my head, I'm resolved to disengaged, to withdraw the negative attention and provoked responses they seem to seek from me.

In other words, my strategy with them and my inner world are two different things. I don't need to figure this out to get out of harm's way.