Pointing out the flaws of these "great" individuals, heroes of humanity's past simply accomplishes nothing. They're long dead. They have notable accomplishments, that will be taught as history. Saying, "but he was a piece of shit according to my moral standard" doesn't really do anything except start a big argument. And that is a waste of time and energy, and a distraction from more important issues.

If your argument is "your shirt with a picture of Lincoln on it offends me - he was a racist!", then I guess you can just kick rocks or whatever.

P.S. "racist" is lately feeling really close to "communist" of the 50s as far as how effectual it is in describing a person's character. A witch hunt, in other words.