Creatures that society doesn't need in their neighborhood. I would be ok with it because my offer is not that kind of self justice that you wanted to do.
There are hundreds of registered sex offenders living within a few miles of my house, some of which are level-3 dangerous violent predators who are considered highly likely to re-offend. One of them used to stand and watch the grade-schoolers walking out of our local elementary school every day until we called the police enough times to discourage him.
If these guys don't meet your criteria of "Creatures that society doesn't need in their neighborhood." I can't imagine who does.