Actually, I shouldn't joke about the criminal in Dallas because in the article I read about him, it stated that he had a history of mental illness. That doesn't excuse what he did, but may explain his actions -- or not?
Note that I'm not trying to start a debate about mental illness. I just realized that this was in his background.
In any case, I sincerely hope that person (in Dallas) gets the help he needs because it is quite clear how much it is needed.