You say you just want to be left alone and then you makes these claims that cops are worthless because they don't stop crime.
If I'm a cop and my job is to stop the crime from taking place, almost by necessity I cannot "leave you alone", I have to step in and stop you before the crime even took place. And then THAT is going to get people like you all worked up. If police are going to be held accountable every time someone enters a building and shoots people, we need to let them pat people down and do whatever they need to in order to make sure that person isn't dangerous before entering a building. The exact opposite of "leaving them alone."
Cops don't directly stop all crime, that would be an impossible task in a free society. They prosecute crimes, which in effect is a deterrent against crime, because people don't want to pay fines and/or spend time in jail.
I feel like I'm talking to a complete imbecile here. Maybe I am.