Wait, what's that you're saying? He didn't play in the 1950s? WELL, GET LOST, HATER! I DON'T CARE ABOUT HISTORY! EVERYONE, EVERYWHERE, AT ALL TIMES MUST BE COMPARED TO LEBRON! LEBRON IS THE BEST!
That's kind of what I hear when I see that people are tearing down monuments and holidays to George Washington and Thomas Jefferson. The critics aren't comparing those two giants to their contemporaries, they are comparing them to the standards of today. If you look at who else is available as a paragon of virtue and heroism from their era, there really isn't much competition.
Mankind is in a constant state of technological, moral, political and artistic evolution. Passing judgment on individual people from the 1700s using the standards of the 2010s or even the 1200s doesn't make a whole lot of sense.
As L. P. Hartley said, "The past is a foreign country; they do things differently there."