This is only a problem if you treat employees in a way that makes them want to go rogue and sabotage some systems.. maybe don't fire them without warning or cause, or clear reasoning? I suppose if someone is actually able to tangibly impact some critical system, limit their access to that, but beyond that, it's just an excuse to make it sound OK to abruptly dump someone from a social and professional context. Maybe it's legal, but is it necessary? No. Is it traumatizing? Yes.