Paramilitary SWAT should not exist in the United States.
I see some value in it's existence, but not the way it's almost always deployed. If it's there solely as a reactionary force, fine. But, police departments, as seen in this case, use it almost exclusively as an offensive tool.
As LoneRangerMassachusetts mentioned earlier, they should have waited for this guy to go to work in the morning and nabbed him as soon as he started to back out of his driveway. This, as usual, was completely unnecessary dangerous.