That police force better be from out of town because otherwise the locals know exactly where the cops live.
Eventually, that police force will start to dwindle in number and die off after each unsuccessful raid.
Cops and politicians know it would be suicidal to try to disarm all of America.
Even if you get local LEO’s to engage in kick down the door raids eventually through attrition there are more of us than them. You are correct. If the goons kill one gun owner and he/she takes out one or two goons the numbers quickly turn into a nightmare for the peddlers of tyranny.