BRAVO to them for "giving chase" but isn't it too bad that giving chase is ALL one can do when one lives in a country that enforces unilateral personal disarmament? Maybe armed and free Englishmen and women would have been able to do more than give chase...would he have been able to "evade" a 9mm so easily?
Do you really want a couple of dozen panicky commuters blasting away in a cross-fire? Sounds like a bad thing to me.
The guys who killed todays' creep absolutely knew what they were doing. They closed with him, grappled and dropped him, two of them held him down so their mate could empty a clip into him downwards, to avoid injuring innocent commuters.