I’ve seen more American flags than I care to remember being burned in the streets in many countries, including Britain. I’ve also seen British flags being burned occasionally, again including in Britain, but more usually abroad. Certainly Britain’s involvement in Iraq and Afghanistan, thank you Mr Blair, have caused an increase in flag burning and terrorism all over the world. However, how do you not respond to 9/11? There had to be a response to that atrocity.
However the PLO were committing terror attacks before any of that. It’s been going on since the 70s and before. Plane hijackings and even a cruise ship I think, where the Americans were singled out and some murdered. I remember the PLO murdering an American disabled man on a plane they hijacked and they threw his body and wheelchair if I remember rightly, certainly his body was thrown out of the plane on to the tarmac.