I saw the report and the seemed upset, but the young man's brother said that he was the one who called, and he warned the cops that his brother was armed.
In their moments of shock and grief, of course they will want answers and to place blame. Yes, they will say that killing their brother wasn't the kind of help they were seeking when they called. Still, they seemed, in the report I saw, to understand that the cops didn't have a lot of choice here.