We do that too. Ask the millions who benefited this year from the Church's welfare system, the people who received emergency food, shelter, and assistance. But that was all temporal and doesn't help our ancestors who died without having a chance to hear the Gospel or to be baptised and recieve other saving ordinances. Nor does it help those whose marriages were only until death did they part and therefore their families would not be together after this life. It is a great work - daunting in its scope - and sustained only by faith. How do you exercise your faith in your religion?