The objective of Pigeon's Revenge 2 is to, uh, excrete fecies onto as many people as possible.
Shoot?: Hold the left mouse button to build up power, release to... release
Practice for a while until you understand how much power you need to build up to get it a certain distance, and how to time it to hit someone. Hit the kids with slingshots twice to get rid of them. If you hit a baby in a stroller, the mother will stop, allowing you to hit her too. If you hit a policeman he'll shoot at you, but he's worth a lot of points.