What this thread is about is DESTRUCTION or eroding of Western civilization.
I'll respond to this part, since the rest didn't seem to make any real point. Western civilisation is certainly not at risk of destruction anytime soon, at least not from the outside anyway. Erosion though? Well, that's how life unfolds isn't it. A cliff doesn't stand for ever, time and tide take their toll. Things change and old certainties give way to new ones as people move around and ideas progress. The Roman empire eroded too, eventually to the point of schism, but that didn't stop humanity evolving culturally, and look where we are today in comparison to then.
The real threats facing civilisation now are not so much cultural, but environmental. If climate change and the loss of vital habitat continues, then sooner or later there will be no civilisation left at all, western or otherwise, it's about priorities. Civilisation changing through the movement of people is not something that can ever be avoided, you have to deal with it. The environmental issues on the other hand might yet be averted, if we focus more of our attention on them.
What this thread ultimately boils down to is this. The world is changing, and you're scared. If you want a round of applause for that, then you've probably come to the wrong place.
Now go ahead and down-vote this post for not tickling your ears.