What will serve is treating these savages the same way they treat "unbelievers" - leave, convert, or die.
If we don't the result of this will be in their favor.
We need to civilize the savages, or tell them to stay in the bush, that is.
As long as their behavior includes unimaginable stupidity, cruelty, and rage against God (however they may think of it themselves, this is what it is, in fact)then I see no reason whatever to welcome them into our midst.
And if we do, what makes "us" any different from "them"?