Really wouldn't be that hard, they could point to several passages in the Bible that could justify him being a rapist and paedophile because they took it wildly out of context. IIRC Mary was something like 13 when she's was betrothed to Joseph.
The Bible contradicts a lot about how these guys handle stuff while invoking it, but that's one area where, because of the times in which it's referencing, there are examples that fit their narrative. Honestly I'm surprised they haven't used that already, but it's probably because none of them have actually read it.
I get the sentiment, and by no means are the reservations good or something that should've been how it played out, but I do feel like putting them on the same level as ICE centers and concentration camps downplays just how bad those latter two really are/were.