Everything you say about Kavanaugh is true. In "normal" times, there would be a hold while the allegations are investigated and/or another nominee would be put forward, but these are not "normal" times.
Democrats have used every procedural trick to delay/block every nominee put forward by Trump and that have already stated that if they win control of the Senate, they will block any other Supreme Court appointment until after the 2020 election. So the political calculus by the GOP is confirm Kavanaugh now or risk that they cannot get another appointment through until 2021.
Despite all the moral high ground claimed by both sides, this is just raw power politics, nothing else.
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