Unless people dig up corpses out of the ground, why should I care?
Sounds quite similar to the respose SLC recently gave the Jews when they complained about their dead being proxy' baptized.
https://www.google.com/search?q=mormon+baptize+dead+jews&rls=com.microsoft:en-US:IE-Address&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7ADRA_enUS475&gws_rd=ssl