As to the "guilty until proven innocent" point -- while this has some weight, it's important to distinguish legal considerations from moral ones. I have no doubt that, were I on the jury in Kavanaugh's trial, I would have full respect for the "innocent until proven guilty" principle and acquit him of these charges. Based on what has been presented so far, no jury could do anything but acquit. But that is fundamentally different from social and moral considerations. As I have already mentioned, it's transparently obvious that Kavanaugh is the more untrustworthy of the two, and has lied -- there is no other word for it -- about his drinking habits. That alone should be enough to end his chances of becoming a Supreme Court judge, let alone the fiery and partisan display at last week's hearing.
Also, although I don't wish to dwell on this too greatly, Kavanaugh's denial means little. Why should he remember an incident from 36 years ago, during which time he was probably, if not drunk, then certainly the worse for wear, which probably meant rather little to him? On the other hand, anyone can tell you that being the victim of a crime leaves emotional scars even after the specific details have long faded. Hence, the fact that Blasey Ford's account has serious gaps in it is -- and should be -- enough to undermine any hope of criminal conviction, but should hardly be enough, as Trump did, to call her a liar and a political pawn. It's just not reasonable to expect her memory of the event beforehand (fairly meaningless) and afterwards (likely to be a dazed blur) to be as complete as the definite emotional aspects of feeling vulnerable and being laughed at.
My point, anyway, is that we are hardly living in a world of "guilty until proven innocent" -- or certainly no more so than we ever have been -- because you are confusing legal principles with social ones. The balance of power is shifting away from a time when sexual predators could guarantee the silence of victims through fear; that can only be a good thing.