Great posts relating the attacks on London to the West's collective failure to assimilate immigrants here, here and here.

The put it all simply, our policies regarding nearly unfettered immigration from cultural regions demonstrably hostile to our way of life are suicidal. Our failure to enfore immigration laws led directly to 9-11 and probably had a great deal to do with the Madrid and London attacks. Our elected leaders across the West still don't get it, even after years of war. They won't get it until we lose a city to terrorist attack, and maybe not even then.

Political correctness is prolonging a war that probably could have been won by now and is getting people killed. Yet political correctness is just about the only unassailable and unstoppable political "virtue" left.