The immigrant is responsible for adopting and assimilating into the nation that adopts it. If an immigrant changes the Nation, adversely or otherwise, it ceases becoming an immigrant and becomes an invader.
If a Nation changes adversely for the benefit of the immigrant, then the incentive for the Nation to accept immigrants reduces, or becomes zero.
Thats why vetting is important.
I love the USA because I could say whatever the fuck I want without fear of government doing something to me (no longer the case).
It affords me and my family a middle class lifestyle within only 1 generation as long as we work hard.
Oh, and 2A amendment wound ensure that we would never end up helpless as many folks in our birth country did.
I cringe and despise the loud mouth democrat sponsored "immigrants" with the entitlement attitude and blaming white people for everything attitude.