There's that phase again... "should be"... The Senate majority is in the best position to make things how they "should be", so maybe the Senate Republicans "should" be the "bigger people" and apologize for their lack of collegiality and partisan politicizing of the SCOTUS... then announce that they are requesting that Garland is reconsidered, and promise to give him a vote. This would be an excellent overture to restoring an apolitical spirit to SCOTUS nominations... It would also be a great opportunity for them to then ask that in return that the Democrats agree that Gorsuch will be first in line for the next opening in the SCOTUS, regardless of the party of the President when the vacancy arises.
That reduces the politicization of the entire process and restores a measure of good faith and collegiality in a way that only the Senate majority can. However, as we both know, this wont happen, because the Court is political and the Republicans would never give up their political advantage in the name of some "apolitical ideal." Bringing that up as a reason Democrats should cave is just rank child psychology, and not the least bit persuasive.