Not sure this is harming the innocent. The LDS leadership may argue it does no harm for a person not to be baptized until they're 18 and can make their own decision in the matter.
Mormon baptism is not the same as Catholic/Christian baptism -- they are different in kind --- but I know that in the Catholic Church, infant baptism must be predicated on the well-founded expectation that the child will be raised Catholic. This is why you can't just go about grabbing kids and baptizing them.
If the parents think their same-sex "marriage" is fundamentally right, and therefore the Mormons are fundamentally wrong, why would they want their child to be baptized Mormon? If they did, it would seem like a set-up to me.
Exactly. And you can say that again.