There was a article here a few days ago by a SWAT leader. One of the things in it was that SWAT should go on every call they could talk their way into even drug raids and serving warrants. He thought it made the brass and the public understand how "useful" SWAT was.
It sounded like a recipe for disaster to me, providing that you have a actual need for a SWAT you should not be using them all the time. It will either blunt the edge they should have or, worse yet, they will keep that edge and react to what is at most petty crime as if it were a major felony.
Either way you are going to get people killed needlessly.