It’s horrible but trying to force-ably separate them at this point would only lead to the minors being hidden from view, deepening the abuse. Additionally, the minors are highly unlikely to actually leave their spouse, no matter how bad their situation is. Adding fuel to the “society doesn’t want us together” would only serve to deepen the minor’s distrust in everyone but their spouse, making it much harder to help them from any ongoing abuse.
Even having an opinionated choice would be better than what we currently have.