McConnell and McCarthy are probably afraid of a repeated scene of booing like Trump received…none of the Republicans who are crapping on Ginsburg’s legacy are very popular in DC right now.
Also, the plan is for Trump to nominate someone tomorrow, and the Senate to have its vote on Oct. 26th, about a month later. From RBG’s death to the vote is just a little longer than the time between Scalia’s death and Obama nominating Garland, and will be the shortest nominating process of any justice in the past several decades. The Republicans deserve all the scorn for the way they are doing this that the nation can put out, and hopefully that scorn comes out a week later.