I think this is a really interesting set of thoughts. I don't think you're worrying too much, although I think phrasing it as worrying might be giving yourself too much reason to stress. Basically, I think it's incredibly important to remember where they came from and what their effect was, but that doesn't make them not beautiful. Human history is a complicated thing, and the end results are often beautiful. I mean, in my country, EVERYTHING, practically, is the result of a historic crime -- the theft of a continent. My city was stolen from the people who lived there first, people who were killed both casually and intentionally, people who are now the tiniest fragment of a minority in the city's population, but that doesn't mean I don't love my city. It just means I need to remember where it came from.