While I understand your point, I take exception.
While there was certainly a great loss of life in WWI, and to a certain extent during WWII, that alone is not an excuse for what England, Britain and the rest of old Europe has become.
It is a common and simplistice answer for what has happened.
I think the larger point is that along with he loss of so many lives (and the horrors of the Somme and Stalingrad and Buchenwald) came a loss of righteousness in Western Europe. Positivism was replaced by relativism. If our culture brought us to this, then what is our culture worth? It’s a fair question.