The Worst of GTA Logic Memes
Gun Logic is listed (or ranked) 1 on the list
#12 Rocket Launcher
This shows that the police think more about their car than you walking around armed like a small army all on your own. Yes they will indeed allow you to walk around with a rocket launcher and not say a world, but you better pray for mercy if you bump into their car as they are going to go crazy and shoot at you like mad until you are pretty much dead.