The overuse of SWAT is ridiculous, but sending them into a shots fired / hostage / bodies on the ground situation is entirely appropriate. And no different from most other developed countries. If you go into a house in Germany, shoot someone, and then threaten to shoot everyone else, do you really think you’re going to get an officer or two casually knocking on the door without weapons at the ready?
German cops have fired a total of 52 bullets in 2016, which killed 11 people. I think it’s very likely that situation would have had a different outcome.
It's important to not equate sending SWAT "into a shots fired / hostage / bodies on the ground situation" and a situation where it's been claimed by an anonymous phone call that something like that might be the case.
It's not the same. It's reasonable to respond with lethal force after shots have been fired by the opponent, it's totally not reasonable to do so when you suspect that it might be the case that they might get fired with no good evidence that it actually is so.
