I mean, we have also left the Mayan pyramids standing despite being monuments to sacrificial human murder. Nobody is looking at Conquistadors in the 21st century as some sort of inspiration for the future. History happened, it was significant, over a billion people speak Spanish because of it, for better or for worse. That's all of human history, it's one giant mess. It's frankly amazing that it turned out as well as it did, because war and conquering was always a constant in human history...of course, what we're experiencing now could be a relatively temporary time of stability before we descend into a world war again.