We need to make sure they never, ever, ever have confidence that they can indeed pull it off.
The instant they believe they can get away with it, without any personal loss, they will try it.
So what if a few hundred, or a few thousand LEOs or Military are sacrificed on the alter of the greater good?
I’m not going to get into a lot of your “what ifs” here... But the answers to your questions are easy to answer.