All right, a little more coherent. Yes, they do it. No, it's not nice. Sometimes it's downright evil.
In my case it's to bring my anger out. I have a bad habit of letting people treat me badly. Actually, in the past I didn't even realize they were treating me badly. It was normal to me. I've dealt with it by moving to the other side of the world and withdrawing from almost everybody I know.
The trouble is though, I think everything through. I can see how I do similar thoughtless things and then I feel like it's hypocritical of me to be angry at the other person for doing something not so different from what I have done.
Now I'll stop hijacking this thread and go make my own