Judge Brett Kavanaugh is one of the most highly qualified Judges for the Supreme Court available. To allow unproven allegations arriving at the eleventh hour to halt nominee selection votes regularly could make it very difficult to ever add anyone to the court. In a nation of 320 million people there is no end of possible accusations that could be made.
Democrats want to stop the addition of any conservative to the U.S. Supreme Court. Most Republicans would prefer not to add a liberal-leftist-corporatist judicial activist again, hence the present fight.
The next session of the court begins in early October so any delays the Democrats can make help to keep their agenda at SCOTUS more viable. The Ford accusation is a partial birth abortion of the nomination vote. Any tool to spike conservative guns will be tried.
In the future some sort of regular time table should be established to stop last-minute accusations with amorphous evidence credibility from delaying proceedings. Objections to a nominee should be required to appear within an open season that ends at least 30 days prior to the Senate Judiciary Committee vote on the nominee.