I'm not missing anything. You're in "theory" mode, and I'm in the "here and now, it's gonna happen and bite us in the ass" mode.
And that, if we don't do something about it, now, we're going to spend the rest of this session with their teeth in our butt.
Following which, we risk losing seats (if not control) and becoming increasingly toothless ourselves.
It's called self-defense!