Believe me, I say this with deep understanding of the ire that some feel about the general things the U.S. gets up to.
But until the Citigroup building and another of them on the Docklands has planes from LHR flown into them and another into Parliament or the UK equivalent to the Pentagon, it's hard for others to understand the undue "skittish"-ness.
Worse, if you saw it as I did on 9/11 up close and in person at the Pentagon.
And then the nutty Detroit thing. We are just overly sensitive on our own soil after all of that when it comes to miscreants in aluminum tubes doing bizarre things.
And if folks had been as militant as you are suggesting about waving guns in faces of dusky folks, an army major professing deep hatred couldn't have been ignored so long by his chain of command and colleagues, due to PC before he killed two dozen on an army base in the name of allah..
If anything, we are as much caught up in the PC brigade as the UK is, when it comes to stepping in before disaster.