Republicans have launched multiple attacks on the legitimacy of the Supreme Court. Everything from abortion, religious type cases, guns, etc. That great phrase of "judicial activism" certainly was spouted enough--a clear calling out of the legitimacy of the court. Nevertheless, take a look at the appointments over the years:
1969-1972: Nixon appointed Warren Burger, Harry Blackmun, William Rehnquist, and Lewis Powell;
1975: Ford appointed John Paul Stevens
Just in those 6 years, Republicans were able to nominate a majority of the Supreme Court. What's to complain about there?
1981-1988: Reagan appointed Scalia, Kennedy, O'Connor;
1990-1991: GHWB appointed David Souter and Clarence Thomas;
1993-1994: Clinton appointed Ginsburg and Breyer
2005-2006: GWB appointed Roberts and Alito
2009-2010: Obama appointed Sotomayor and Kagan
2017-2020: Trump appointed Gorsuch, Kavanaugh and Barrett
2022: Biden appointed Jackson
If you are a Republican, what is there to complaint about? Since 1969, Democrats have only had 5 appointments to the Court, while the republicans had 15.