The kids are probably in even greater need of compassion than the lady they were harassing is, because they probably learned this attitude at the core of this behavior from their parents.
I neither feel compassion nor hate for them. I detest them for their behavior, and think what they need is some sort of long, unpleasant punishment (e.g. grounded for 4 weeks, during which they clean out the Augean stable) but this is not worthy of any permanent judgement.