Christians are not to be in the revenge business…

Of course, this ban against revenge is misinterpreted often to mean Christians should be pacifists or sissies. The scripture says nothing of the like, and there are clear prescriptions against pacifism (in the next chapter) and being a nance all over scripture.
Nevertheless, personal revenge clouds the soul and always make the situation worse and not better. When you are wronged learn to do no wrong in return, lest you make the situation spiral downwards.