In my opinion, Kavanaugh did enough by himself to fail confirmation. Eg: His FOX interview where he presented himself as some virtuous choirboy was WAY over the top, when there is all sorts of evidence that he was a partier. So why go there, since being a partier is not necessarily a bad thing - but lying about being one is. Then yesterday, he let his emotions get the better of him and he launched into his highly partisan conspiracy theory where the entire Democrat Party conspired to deny him this appointment. So let's say he IS appointed - how will he be able to make judgements without his obvious political bias showing through - he's already demonstrated that his emotions can run SO high that he loses it during the most important testimony of his life. Again - entirely his doing, when all he had to do was calmly and professionally deny the accusations.
So he should fail the confirmation strictly on his own mistakes over the past 2 days.