I did watch the video, several times now. And I am not at all sure he intended to 'take down a few cops with him'. In fact, it has occurred to me that it was his intention to have LE focus on him, to protect the others (as stated before) all while he took his own life. If we could only know, what if anything he said.
I still have this nagging feeling that there was something going on with him that no one knew about.
Like he was thinking this was the old west and shooting anyone that got in your way was a good thing. Or maybe he was Super Man with a blue cape and was bullet proof maybe..