I know I sound like a prude but there is no reason for foul language in the studio, kill switch or not. Neil pushes the envelope all the time on the air, but come on he's smart enough not to go too far. Maybe he just wants to go out in a blaze of glory,
A friend of mine is the Engineer in charge on a remote TV production truck. The use freelance crews all the time for the various sporting events. He doesn't tolerate any foul language. If someone does they won't be back again. This applies to the talent and behind the scenes folks. You never know when you're near a live microphone. He takes that very seriously.