For me, nothing is more emblematic of this than Mitch McConnell's handling of Supreme Court nominations.
Following the death of Justice Scalia in 2016, McConnell announced that the Senate would not hold a hearing or a vote for any of Obama's nominees. Mitch justified it by saying it was an election year and "voters should decide." There was absolutely no precedent for this.
McConnell justified this power grab by inventing the "McConnell Rule," an unofficial rule he just pulled out of his ass, stating that a president's Supreme Court nominee would be blocked during an election year if the president's party did not control the Senate. It was simply an exercise of raw, naked, in-your-face political power.
In 2020, after the death of Justice Ginsburg, Trump nominated Amy Coney Barrett to the Supreme Court, also during a presidential election year. This time McConnell rammed a vote on Barrett through the Senate, justifying it by saying the vote should be held because the presidency and the Senate were controlled by the same party.
Republicans do whatever is necessary to gain and keep power, justifications don't matter to them.