Trump, eulogizing Kirk on Sunday in Arizona, identified “reason and open debate” as “the basis of our entire society” and the “inheritance of every free American.” His son, Donald Trump Jr., told the crowd, “When people disagree with us, we don’t silence them.” Yet amid mourning for Kirk, the president, members of his administration and a broader universe of conservative supporters have seemed to impose a double standard by targeting those who have been critical of Kirk and celebrating when employees were disciplined or fired over their comments. Trump welcomed Jimmy Kimmel’s suspension when his network decided to pull the...