Why are government entities reactive, rather than proactive.

Middle Township - Why are government entities reactive, rather than proactive. They only react after a tragedy has occurred, rather than averting a tragedy. Case in Point: It is time for a traffic light at the entrance/exit to Garden Lake Mobile Home Park. There are over 300 homes in this development and entering and exiting the park is at time very dangerous. The County, or the Township should address this situation before some one is killed, not after.