Originally SWAT was created for when you had that wave of Black Panther and Weather Underground extremely violent bank robberies, the SLA cornered in a house, etc.
Now every city has one, and they seem to use them constantly for the most trivial arrests.
This man for example. In the old days two clean cut men in sport coats would knock on his door. Now they hit with full fury and look like scrotes with beards and full paratrooper garb.
I've heard the term "Gear Queers" applied to them.
I think most of them are mentally ill, deranged losers who have delusions of being Navy SEALs, but lack the talent to even be circus seals.