I can partly see why they did it.

Running was infinitely stupid. In such a crowded place, with such a strong police presence everywhere, even if there were blokes chasing me, I wouldn't run. And of they shouted 'armed police' I'd lay face down on the floor in a heartbeat.

Also, what with these most recent bombs not going off properly, it would be understandable if he had been wired, to wait, rather than run along try to cause an explosion which may not have worked.

The public knows there's a shoot to kill, Isreali style in the head, but five? That makes them seem panicky, out of control. Two shots in the head would have done the job, and people would have understood more.

Still, what if he had been carrying explosives and detonated them?
Any coppers in the area who'd passed up the chance to shoot him int he head would have been hung drawn and quatered. There's too much at stake.