Getting people arrested is more fun than it has any right to be.
So if you see people trying to steal a car in the parking lot at 5.00 am in the morning, it should be considered civic duty to make a call, unemotional resolute response, civil courage and all that crap. In reality however it is just fucking funny to sit on your balcony with binoculars and see the cop cars pull up out of the blue, tune the police scanner up, and see the druggies shitting themselves. You just go "LOL PWNED!" and "Reinforcements have arrived..", it's empowering.