You may not hear them. It's a tense situation , because you do not hear them you deserve to get shot? If I was the bad guy I would just yell police come out with your hands up and you dolts would walk out? The "authorities"
Have less of a right to go home alive than the homeowner imho. They signed up knowing the risks and get paid to do it. This militaristic attitude that they get to break and kill everything in site so they can go home at night is BS. They need to show a lot more restraint and realize they work for the homeowner not the other way around.