Fuck that. There is no response required for a false allegation, and most couldn't possibly prove a negative. The onus of proof doesn't lie with the accused!
The takeaway lesson is that the correct venue for any allegation isn't Twitter. Twitter needs to end this insanity, and censor any accusation made on their platform. They've already demonstrated as a private company they have no issue with censorship. It's the only responsible way to handle this stuff.
I'll say it again. These accusers, when they allege a crime, should face sentencing equal to what would be considered for the crime they allege, if the accusation is fabricated, and that can be proven. So if the person they accuse would face a 15-year prison sentence? If the accusation can be proven to be a lie to a satisfactory standard of proof, that false accuser should face 15 years.
I also believe in this social media age that we need to loosen up the standards for libel to address those accusations which don't allege an act that is criminal, but is intended to ruin someone's career and reputation with a lesser smear.