I remember an old TV skit from the 70's with Richard Pryor in full African costume trying to run a telethon for a Black Panther-like cause and getting no callers. But when he finally told the audience a certain percentage of their donations would go toward the Back to Africa Movement, the phones started ringing off the hook. :)
It just seems like the logical solution to me. Of course the ones that are willing to work and be productive citizens and love this country are welcome to stay but the thugs, drug pushers, and those that obviously hate this country and everything it stands for and think they will be respected in Africa are welcome to give it a go.
When they get there and find themselves living in a mud hut, no fancy shoes, no dope, and nobody to rob because nobody else has anything either they will change their minds but I won’t buy them a ticket back.