It's ridiculous that people are making excuses for racism. Accepting racism because "it exists everywhere" is like accepting cancer because it exists everywhere. Sure, accept it, don't confront it, don't fight it and it will kill you sooner or later. 

I suppose most of the excuses and denials have to do with people's personal situations. After all it is pretty incovenient to have to deal with the consquences of racism and prejudice once you accept it exists and needs to be dealt with. Much more easier to bury your head in the sand and hope the storm passes.