There is no one here who got banned just for saying something inappropriate. They get warnings and a PM first advising them to not do what they were doing/saying anymore. In fact they get much more than just one PM. When they do eventually get banned it's usually when many many PMs were not cutting it and the member was still doing what he/she was asked not to do.

Others that you think might not have done anything very terrible actually did, but their post or thread that contributed to their ban would have been removed from the view of regular members.