They're not consciously letting Muslims take over towns just to willingly destroy their own country. It just so happens that decades of poor foreign policy by the West have destabilised the Middle East (that's not to say Middle Eastern countries also don't have their own agency to improve their own situation) creating massive inflows of refugees. And the EU, which happens to be next door, had to take in refugees from Muslim-majority country. Or else what? Let them die or shelterless?

I can hear some already asking why won't neighbouring Muslim countries take in their fellow Muslim refugees? They have the same culture and would cause few tension, right? These countries already did. Turkey alone took three million Syrian refugees. They have the majority of Muslim refugees, not Europe. But the Western media with their parochial, in-group bias over-report and overemphasise tensions with Muslims migrants. Turkey has the same problem to the point that immigration has become a sticking point in the last Turkish presidential election. The left-leaning rival candidate reluctantly had to resort to anti-immigration rhetoric in the last days before the election to boost ratings. You won't hear that in mainstream news in the West, won't you?

Really, these news of EU wrecking itself by "allowing migrants thanks to open borders" is literally fake news. People sympathise with that racist and far-right rhetoric without viewing the full picture. But I guess people are still tribal with our un-evolved lizard-brain to think in heuristics and stereotypes. We just easily buy in to the angry rhetoric.

Also, I definitely agree that mass migration is causing tension, I'm not denying that. However, climate change is worsening domestic situations in developing countries on top of poor foreign policies. The Arab Spring, Syrian civil war, and conflicts in Africa is exacerbated by climate change as drought worsens, which leads to more hungry mouths which then leads to social and political tensions as they blame their governments. Refugees then leave and risks travelling through deserts, mountains and sea to more stable places like Europe. What is the EU going to do? Let them drown? And then they get blamed for massacring civilians? Damned if you do, damned if you don't.

Edit: spelling