This is partisanship. The exact mirror of this is occurring on the conservative side. Their rage at the Democrats for dragging up a he said/she said from three decades ago is incandescent. The Republican politicians are doing EXACTLY what their constituents are demanding from them. A politician who did not confirm Kavanaugh would have been run out on a rail by the Republican base which appears to be about 40% of the population.
When I look at Trump's approval ratings, it is staggering when compared to every other President. They simply do not move (all others Presidents had widely moving ratings). The country is effectively split. We have two populations that loathe each other beyond comprehension living in the same country. Every conservative I have spoken to consider progressive Americans as the single greatest threat to American civilization that has ever existed. Greater than Hitler, and greater than the USSR.
Johnathon Haidt showed a study of the partisanship hatred over the course of American history. America is now at levels that are equal to right before the Civil War. We are Balkanized. One does not need to look far to see what happens in Balkanized states eventually. He doesn't believe America can last another 30 years on this trajectory. It does look kind of grim. This has spread throughout Europe as well.
The three great untruths:
1. Whatever doesn't kill you, makes you weaker.
2. Always trust your feelings.
3. Life is a battle between good people and evil people.
https://projects.fivethirtyeight.com/trump-approval-ratings/