Criminal Tendencies

It is difficult to explain, but I will give a brief description of the situation.

Whenever I happen upon someone who seems a suitable target, I find myself with an overwhelming urge to take something from them, touch them up or strangle them (depending on who they are - but they are always adults, just to make that clear). Each time, my conscience holds me back. I have written to some people elsewhere on these boards and their opinion is that these urges are a result of repressed anger. Would you agree that this is the case or does it seem like a sign of something else? Is it enough to control my behaviour or is there something else I need to be doing? (Serious answers please. I am after advice, not punishment).