And the problem is, those people who do emigrate are those that can emigrate. The affluent people, the educated ones. The ones that could bring about change in their countries of origin had they not emigrated. The people that could possibly lessen the suffering of those 95% instead of leaving them desperate in perpetuity.

This is not necessarily true, it varies a lot. Many immigrants to Europe are not educated or affluent at all and wish to live in a more socially mobile society as opposed to their home country where they have no hope of joining the affluent or educated.

But the fact that beheadings are a possibility in the British capital in the 21st century doesn't sit with me right. Neither does the fact that there is a sizeable group of people in western Europe today wanting to enforce Sharia law in their communities.

What makes you think these are such a possibility? Simply the presence of Muslims? The groups of people you are referring to exist, but aren't particularly sizeable. Criticism should be directed at these specific people, not Muslims as a whole or immigrants.

I say this mainly because while there are people like you who see no benefit to immigration, changes have already happened that aren't reversible. For example, I come from a Muslim immigrant family that came in the 60s. I have no connection to my country of ancestry since it was my grandparents who immigrated. This is the situation for many Muslims in London. There's no undoing it, no going back, and I honestly believe it's mostly been positive. Immigration is so ingrained into the culture at this point that even those against it regularly engage in its benefits. In the UK at least, there is no choice but to embrace immigration. There are ways to face the challenges that come with this - rejecting the idea of immigration all together isn't constructive and denying that it hasn't had some positive influence is just incorrect. I can't speak on anything regarding your country though, since I imagine it's quite different.