@Ken, with only 7 members “banned” in the years we have been on this forum, I’d say banning is not over used. Obviously spammers are not considered in this discussion.
We do ban when the person makes physical threats against others (and repeats them) and/or against the project/team. Bans are not decided quickly either, a member has to work at being banned.
To see who is banned or suspended then see this topic.