Same reason I don't reach for a drill when my teeth start to hurt: I go to a specialist and pay them to do it for me. I'm under no illusion that the state of my tactical training (read: none) is somehow sufficient to accomplish a task like that. For someone like me to have any hope of pulling that off, we'd need some winning-the-lottery tier luck for the circumstances to align in a way that a crime of opportunity becomes feasible.
If only we had large number of people who are specialized with that kind of training and are both paid and oath-bound to use it on behalf of the rest of the citizenry.
...Oh hey!

...huh... so far just crickets.