As a matter of fact, why make criminals think they need to arm themselves even more? Police need to arm themselves for personal protection and that's it. Police have never been armed to protect you, period! Their role is to secure the crime scene, sort out witnesses and evidence, run it by a judge via the prosecuting attorney, and then go arrest the criminals while they buy a gallon of milk and a pack of diapers at the local Circle K.
Good heavens, man! Did you miss the bank-robbery-turned-shootout of North Hollywood, CA in 1997? That provided plenty of reasons, 44 minutes worth.
Yes, I understand your post was just an anti-LEO tirade. So be it.