So we'll judge historical figures by today's standards, disregarding their accomplishments, and just tear down every single monument there is. How do you think people will feel about factory farming in 200 years' time? Or about turning a blind eye to child labour just so we can get those nice durable batteries on our phones to text kitten memes with? Just to name two examples that will probably make us look like savages to our great grandchildren.

It's naive at best.