Who said they must come home. They must be killed to the man.
John Walker Lindh fought for the Taliban, and was tried for treason if I recall correctly. He got a 20,year priison sentence. Realistically we won’t revoke citizenship from these people. As far as I know Lindh will still be an American citizen when he gets out of prison.
I agree we should banish them and say they give up citizenship if they go fight for ISIS. But it won’t happen.