So arguing on Kavanaugh's merits doesn't matter more than focusing on an accusation with hardly any corroborating evidence? Considering how much of a trainwreck this has become for the Democratic Party, at least arguing on Kavanaugh's merits would give a higher probability of making a difference.
Note that I said higher probability. For you to say that it would not make a difference is your opinion only.
Why would it matter. What actual merits would make one Republican change his vote. The things you listed is what they support so why would that make any difference. It would be different if you presented something they all can agree isn't something they support but that is not the case. Why bring up something that have absolutely not chance of making a even one Republican blink. I do not know, maybe you see something that could have changed the GOP vote but lets be honest, the decision was already made to appoint Kavanaugh, the hearings was just the procedure.