<<No, it's "proof positive" that there is no corroborating evidence.>>
You obviously have no idea what corroborating evidence is. The two guys who tell the story aren't a team. They came forward independently and there is nothing to link one to the other.
The first guy's story is the primary evidence.
The second guy's story corroborates the first guy's.
The other evidence of Allen's racism further corroborates the first guy - - the nooses and Confederate flags in the office, the Confederate flag on the vehicle, the common use of the N-word.
So there are multiple pieces of corroborative evidence, not all of equal strength. Obviously every guy with a Confederate flag in his office doesn't go around stuffing deer heads in mailboxes.
<<If you have nothing other than the accusation of a couple people - who claimed that they were even drunk at the time - then just say so.>>
I have the corroborated story of one eye-witness who had consumed some alcohol and was probably showing the effects at the time. If you are aware of any psychological, toxicological or legal doctrine that says that nobody who was drunk can ever give a true account of what he witnessed in that condition, please let me know. It will be very surprising. Speaking as one who has been drunk on very few occasions in his life, I can assure you that I have been able to remember the salient points of each and every one of those evenings. Drunkenness (except in the world of right-wing crazies) is NOT a synonym for "total amnesia." I know that and you should know that. Please try to keep your arguments within the limits of common sense and common knowledge.
Senator Macacawitz, though drunk, was able to drive his car to and from the black part of town, stuff the mailbox and drive home, all without causing any accident or running the car off the road. Not only did his companion remember the salient points of the evening, so did the other guy, who either (1) forgot the racial element or (2) did not want to mention the racial element to his friend or (3) mentioned the racial element to his friend, who then forgot it. Regardless, you have the story of an eyewitness, and you have corroboration, by hearsay, from another eye-witness, now dead. If you want to rest your case on the speculation that the participants were so fucking wasted that one of them imagined the whole thing and the other one imagined the exact same thing, go ahead. But it won't fly. It's bullshit and most people would be able to recognize it as bullshit.
<<Of course, from now on, I assume you will take the word of anyone who makes accusations, even if they have no corroborating evidence, right? From any side?>>
Would you for the love of sweet suffering Jesus just buy yourself a fucking dictionary and look up the word "corroborate" before you continue to misuse it as ignorantly you have been doing? I'm not your fucking high-school teacher. If you don't know what a fucking word means, just look it the fuck up.
<<I like how we're all supposed to take your viewpoints for granted, yet everyone else has to back up their statements.>>
You don't have to take anything for granted. I suggest to you that you just learn what corroboration really means, ask yourself why these two guys are lying, ask yourself how many times you've been drunk, and of those times how many times were you so drunk that you don't know what happened? AND: use your fucking brain.