Point is if you asked people for the top five racial tension hotspots in the UK, the places where the BNP and similar outfits have been trying to stir up race wars for years, the places where these guys are from would I'm reasonably sure, be pretty high on the list. I used to live up in Yorkshire a couple of decades ago, but it's my impression that is still true. Therefore if we want to understand what caused a bunch of humans to get blown to fuck last week, and maybe stop it happening again, I think we need to recognise that an environment of extreme racial tension may have a role in the causal chain.
I think it's also pretty clear that any people who have been working for decades to create that tension, explicitly aiming at starting a race war to fuel their sordid little hitler jerk-off fantasies, bear a share of the blame.