Yes, even I have not been violent really, if my future self would go back and try to contact my past self, I would think what a mad man is this?? But I think that is normal for humans to think that way.
What I said above comes from frustration during my period of whatever that was. If I would have ran into another me, It could have very easily turned messy.
I cannot definitively say that was me, but indications are that it was indeed another me. I never saw him, but did feel a very strange sensation for about 4 hours that day. It felt as if I was moving about a half of a second slower than everything else. It was very strange. It was almost as if I could sense the presence of something that I suspect was myself.