Hey Emsy
I think most people have harming thoughts about people they dont like... if you did'nt you wouldnt be human.

Of course, it can be a problem with OCD because the disorder latches onto it and worries you. I've never suffered with harm thoughts myself, but no doubt this is just OCD and you'd never act on them. If you had the potential to, I dont think you'd be posting about it.
Steve