GOP: 18 is too young to vote! they can’t make decisions like that at that age!!

also GOP: of course a 12 year old should be allowed to get married!!

Hey, this follows a strict logic. In young marriages they also don't have to make decisions; they are made for them.
Yep. Note the marriages are legal “with parental permission”. It’s basically a way for both sides to treat daughters as tradable property.