But we exist in the states and people are what make a government so is it not to protect the citizens? Why would a cop ever need to respond to a domestic violence call, it has no affect on "state nor government". They do it because THEY ARE suppose to protect and serve citizens as we ARE the state.
The high courts disagree with you. It's been established that police have NO duty to protect an individual. They merely provide a service at large.
http://en.wikipedia.org/wiki/Warren_v._District_of_Columbia