I'm aware of that - but if we have to look over 50 years in the past to try to back up the claim that "the left and right are equally bigotted", then we should

I'm aware of that - but if we have to look over 50 years in the past to try to back up the claim that "the left and right are equally bigotted", then we should really just admit that claim doesn't have a factual basis at the time it was made.