Ok, so how about we go by the same standards we use ourselves in different situations, instead of comparing two sets of standards used by two sets of other people?
When Bill Clinton lied about his sex life, I was totally unconcerned, and thought the Republicans looked ridiculous for impeaching him and trying him. In this case, if I found that Brett Kavanaugh lied about the assault allegations, I would say throw the bum out, because that was the central and significant issue that was being investigated. If he was less than forthcoming and a bit weaselly about how much he drank 2/3 of his lifetime ago.....meh. The senators' questions were worse than the nominee's lies.
And it doesn't mean that I approve of Bill Clinton's lies or Brett Kavanaugh's lies. I don't even understand Kavanaugh's. They were about things 35 years ago, and made him look like a doofus, which is not exactly an endearing quality in a Supreme Court Justice, but when I hear "Perjury!", I think back to a similar situation 20 years ago, and remember how I explained to people that not all lies under oath are perjury. It's only perjury when it is something material to a case.