Though still entirely inappropriate, I highly doubt some neo-nazi did this. More like some 17 yr old jackass playing a prank.
i looked up both of their stats on http://www.basketball-reference.com/ and their stats are very similar. they are practically the same player. you should check it out. I was kinda surprised.
It's not a big deal. Just a stupid prank. No need to reward the vandal with attention -- especially when you can't catch him. Paint over it and move on.
I totally condemn the defacing of the mural but I have to say that when some one draws a swastika on an Israeli man's mural it comes out on the news as a hate crime but when someone sets fire to equipment and leave signs saying to leave and "devil's religion" at a mosque, it's considered simple vandalism.