It should be up to the parents simply because it shouldn't be up to a few law makers to decide.
Seriously, why is it ok nowadays for one person to have a problem with something and we have to cater to that one person's problem with a societal norm. If you don't want to do it, don't. If you want to get it done for your child, get it done. The system is fine the way it is, if it ain't broke don't fix it.