Disclaimer before I begin my post. I don't like the Mormon Church, and I don't care for the Mormons I've met, and I don't care who knows it. You'll get none of this "I'm not a Mormon, but they seem like fine people and some of them are my best friends" nambypamby BS out of me.
Point one: They don't just baptise their ancestors. They baptise whomever they want. Folks on this thread have mentioned Anne Frank. She died as a young girl. She had no children. She's not anybody's ancestor, much less some long lost Mormon granddaughter, and yet it appears that they've performed this ritual on her behalf.
Point two: They can do all the baptising of the dead that they want, but I think non-participants of their religion have every right to be PO'd when they DOCUMENT such happenings. Ridiculous rituals are one thing. Creating and maintaining a database of the non-interested and non-consenting is another.
You don't know that they are not interested and you don't know that they are non-consenting. THEY'RE DEAD!
Keeping a data base is important so that they don't waste their time twice or three times. If they keep a data base, then they can keep their silly time wasting efforts to a minimum.
They certainly have the right to be PO'd. Why, you have the right to be PO'd, if your neighbor rips up his rose bush to plant tomatos.
But your neighbor has the right to rip up his rose bush and the Mormons have the right to perform a ritual for your deceased grandfather and tell people that they've done it.