England and Europe reaching the end of Civilization?

Reading this account of how, not only unpleasant but plainly dangerous life for an American has become in Britain (Britain of all places! Not France or Germany, but the cradle of modern Western Civilization) is a depressing reminder of how close the end seems to loom for Europe, which for several months I've been referring to, with the greatest heartache, as the Tomb of Civilization.

I used to think that the moral depravity and intellectual decay that the "Old Continent" had been experiencing for the last decades would be something from which Europe would bounce back, but more and more I am convinced that the birthplace of my ancestors is in the last and final stages of its existence, before it ceases to be and its empty carcass is taken over by Muslims to be turned into a 21st century version of Al Andalus.

Of course, the underlaying feeling is one of utter puzzlement about how a people (the Europeans) can go from being masters of the world to willfully committing collective suicide. What kind of sinister transformation took place in Europe that turned a once proud and lively culture into a spineless pile of decaying mush?

Are civilizations like individuals, destined to have a finite existence, reaching a peak and then unavoidably fading into oblivion? Maybe so, but it still pains me to see the cradle of my civilization going down the drain --and being driven there by its very keepers, who are none other than my kin.