Why do people apply right and wrong to an issue of preference? There is no law, as far as I know, that says you must know anything about anything. Yes, there is social pressure to learn about your roots, but it isn’t wrong to be ignorant of your ancestors.
The reason why most people want to know about their ancestors is that it will help them understand who they are, or so they believe. Others believe that understanding your ancestors will help you have pride in who you are. A history unlearned is a history denied. If you do not learn history, you are doomed to repeat it.
Well, there’s only so much we can know, so we must be repeating a lot of mistakes others have already made.
In any case, your identity and pride and self-esteem can come from other places besides your own family history. There is no guarantee that you can get those things by knowing your own history.
Each of us makes a choice, I think. The choice is unique and while people judge it, you don’t have to allow yourself to be judged. You need not learn your history to feel good about yourself. You need not learn it in order to be proud of yourself. You may have other interests and that is perfectly legitimate. Anyone who tell you you are wrong for not being interested has their own problems.