That's an easy comment to make from behind the saftey of a keyboard. For a cop, you might get called to something like this [1]. There are plenty of cases where calls get misreported the other wa as well: I knew a cop called to a routine domestic disturbence type situation and walked through a door to a shotgun stuck in his face. He hadn't been told about any firearms or anything and nearly lost his life.

If a person "SWATS" someone, they do so knowing that they're putting people's lives at risk. That's why they do it. IMO this guy should get more than manslaughter. He was trying to get people shot for a laugh (and apparently this wasn't even the only one he had done!).

[1] https://en.wikipedia.org/wiki/North_Hollywood_shootout