The Law of Moses did not directly address the sexual abuse of children.
However, Christ personally expressed his attitude towards those who mistreat children.
“It would be better to be thrown into the sea with a millstone hung around your neck than to cause one of these little ones to fall into sin.”
Might want to check out that word abomination(s) to see what is and is not 'lawful'. Those penalties still apply, it is flesh beings that decided they could do things better. And God controls the blessings and He is keeping the record book that counts for all of us. There are no exceptions of 'everybody is doing it'.