Wouldn't impersonation with the intent to harm someone's reputation count as slander/libel? From what I know it would be, which would be illegal on some level. I'd think Skial would think it prudent to prevent that kind of activity from occurring on their servers. Making things that are legitimately against the law bannable seems smart. Knowingly allowing people to break the law on your servers opens yourself up to all sorts of potential legal problems. It is a good idea to ban people who are committing acts of slander/libel. Especially if it's as clear as it is in this case.