It's hard to understand another person's preferences. For a straight man it is hard to understand why you wouldn't want a woman, the gender that you are attracted to. To be attracted to another man may seem alien and confusing. But really this is the same in not understanding those that are able to run marathons, solve complex mathematical equations, or any other activity different from yourself. That's just the way that person is.
Who cares about lesbian, gay, bisexual, and transgender people and their lives and accomplishments? We all should. But why? During LGBT History Month, we might learn about LGBT people who have made or continue to make a difference to our world. We can learn about their accomplishments and how they have changed science, literature, or many other fields.