This is a tough one and I can understand why Michael raised it.
I do believe in free speech and all that stuff, however there is also such a thing as someone trying to deliberately discredit an organization and what better way to do it than using the internet.
I also believe in the innocent until proven guilty saying and I would say that bots should be blocked to that post until the allegations have been proven or not.
If proved then by all means open it up to everyone, but if there is no evidence to substantiate the claim just block the bots or put up a big comment in red saying Allegation investigated and No proof can be provided to prove the claim. ( This could be a nightmare for the Moderators though )
It really boils down to considering each case on its own merits and weighing up the risks to the company's reputation if the info got spread around and turned out to be untrue.
I voted Yes, On a Temporary Basis