This guy pretty much expressed what I've thought about this subject for at least 15 years. Bringing about rapid demographic changes via immigration is playing with fire. The people who've made these decisions - the ruling classes of Europe - have effectively insulated themselves from all of the consequences of their decisions. They live in gated communities and their kids go to elite schools. Brexit, Trump and the wave of populism - capitalized by the likes of Putin - is an inevitable reaction.

The elites of every society is made up of stupid, selfish and short-sighted sacks of meat just like the rest. Humans are thoroughly unfit to rule over other humans.