Over the course of minutes we are faced with a man who is acting irrational, says he has a bomb, is not cooperating, in fact is running, and then reaches into the backpack...

Possibly so, possibly not. The media reports I have seen indicate that there is some dispute about what actually happened. Remember how in the Lndonn tube shooting Jean Charles de Menenzes was said to have been dressed suspiciously, acting suspiciously, ran away when challenged and leapt over a ticket barrier - and all of that turned out to be a compete pack of falsehoods.

Moral is, don't rush to judgement - either way. Wait for the facts to be established rather better than they have been.