It is a very common pattern in the case of mass shootings that the shooter kills himself. It is often unclear if the shooter intended to do that from the beginning.
But I now question if that is indeed the pattern.
Alternative explanation: What we may be seeing in in fact a police execution of people who had their fun and then surrendured to police. But the responding officer was not going to play that game. Then calling it a suicide ensures that there is no career damaging mess or fuss for the officer.
I would expect a suicidal mad rush or blaze of glory type of assault against the responding police, followed by the police launching 150 rounds, 2 of which strike the shooter (non-fatally). Lots of people survive getting shot by police. But not these guys.
I would also expect the shooter to give up when it became obvious that he wasn’t going to win, and then to depend on the system that has always coddled him to continue to help him out.
The frequency of murder-suicide is too often to be credible to me.