I'm new here, but I'm going to answer this because I think I understand at least some of the underlying issue.
I don't think it's a stretch to say that modern genealogy is built on the work done by Mormons. On the one hand I am tremendously thankful for the data I would never find on my own, but on the other hand I am a little uneasy when I think about their motiviation. Latter-Day Saints research ancestors so they can baptize them (this is not the right term, I know) long after they have died. Many of my ancestors who were avowed Methodists, for example, have been brought into the Mormon fold by posthumous baptismal. At times this bothers me. I don't like the idea of somebody baptizing me after I'm dead -- but I don't like the fact that I was baptized as a baby either. My parents chose to baptize me without consulting my views, because their religion required them to. The Mormons do the same. The reason I can let this go is that when I think about it rationally, it's no skin off my nose. There are too many real problems in the world to let this get to me. Although I will say that I have to laugh when I think of some of my more colorful relatives being dragged, kicking and screaming, into the Latter-Day Saint version of heaven when they prefer the version of heaven that has racetracks, cocktail waitresses in short skirts, and bocci ball courts.
Beyond religion, curiosity is the only reason I can see for pursuing genealogy. I am curious about my ancestors, because I'm endlessly curious about history. Exploring one helps me understand the other. I have come across some not-so-pretty events in my family's past, including a Daniel Ennis who was an innkeeper in the Minisink Valley in New Jersey in the late 1600s, and who had a son by a slave called Delia. On the record books the child's name is given as Sin. I don't feel any compulsion to hide away this information, certainly not in any effort to protect Daniel Ennis. But I will say this: when I talked to my daughter about this (at the time she was fourteen) I saw a light go on for her. It made slavery and the cost of slavery more real, and after that she read about that chapter in our history with the sure understanding that it was more than a story, and directly relevant to her, personally.