RIP RBG.
If the liberals are allowed to pack the courts, democracy is not dying, it is dead. This cannot be allowed to happen.
The McConnell rule states that no party which only holds presidency, and not the senate, should expect the senate to help him in voting through a supreme court justice in his last year. This is a sensible provision which allows voters a say; indeed, it only states that a separate branch of government should act as such and leave the matter to voters. No wonder the democrats hate it.
This has nothing to do with the present situation which is, simply, that a seat has opened, and it is perfectly consistent with all law and practice to nominate and allow the senate to vote for a supreme court justice. Indeed, considering the supreme court might need to decide matters about the election, it would be unwise to leave the seat open.