Your last question really captures the problem: These people have been indoctrinated since pre-school that their nations and culture are not worth preserving. Even worse, they've been taught that their culture is responsible for all of the evil in the world. That's why they must embrace the "other" - the "noble savages" and allow them en masse into their own homelands.
In Malmo, Sweden - a city overrun with Muslim criminal gangs, the local ERs refused to install metal detectors at the entraces because it might be perceived as an 'agressive act' by the local jihadis. It's end-stage liberalism - total suicidal nihilism. The Euros have rejected God, and chosen death over life. Do not gloat - instead look on in horror and dread, America. You are not that far behind on the road into the abyss. The same nihilistic worldview that is now destroying the ancient nations of Europe is busily metastizing its way through this nation as well.
Fully concur with your analysis on the connection between Europe's predominant secularism and the death of their culture.