I agree, banning serves no purpose.

However, it should be noted that there was some political pressure on Germany before those Olympics. The threat of removing the Olympics from Germany did force them to include some Jews in the selection process...

They used Margret Lambert as a symbol of a fair Germany. She was cut from the high jump team weeks before the opening ceremony. Even though she was the best in the nation and could have medaled. Check out, HBOs Hitler's Pawn

There was so much at stake in that Olympics. So coupled with that, to have the grandson of a slave, a skeleton from America's past, and win 4 gold in front of Hitler and the Nazis, in their backyard, at their showcase Olympics??

That's what I call significant.