Practically speaking I'm in favor of strong borders and a selective immigration policy in my country, not the mass uncontrolled mess we are facing now in Europe, but I see your point here.

And historical truth be told: the european conquest of Americas was much more violent and genocidal than the current invasion from Africa to Europe (for now at least).

In addition we all know how past european elites exploited Africa for too many centuries and in so many disgusting ways.

Now we are simply facing the socio-demographical consequences.

As usual with mankind, the problem here is the asymmetry between the victims and the perpetrators.

Million of innocent (usually disadvantaged) people on both sides of the sea are paying for the historical crimes/mistakes committed by few ones in the past.