I would agree that there is no reason not to single out those who are constantly belligerent and vile. When these individuals are easy to identify they are ofte

I would agree that there is no reason not to single out those who are constantly belligerent and vile. When these individuals are easy to identify they are often isolate from a group and do not end up causing many problems. However that is probably not the case that causes the most problems. The case that I have seen cause the most problems are the people who are normally ok but are belligerent and vile with a specific topic and or individual. This hypothetical individual is normally a productive part of the community and may not deserve to singled out. I would not out such a person unless I had good reason to believe that that they would be treated rationally and that the community would only see it as an opportunity to help said hypothetical individual to become more rational.