Astute observation. ;-)
Who else got sacked because of comments? Well, the "Jimmy the Greek" by talking about the slave owners breeding their slaves and that is why blacks are good athletes. Howard Cosell used that "look at that little monkey go!" comment. Both of those were much worse than what Rush said.
But---just like Dr Larua, Rush got targeted and hurt.
And the Liberals sit there and warn everyone about "Right Wing Media" and want the "Fairness Doctrine" to protect us from it.
Sure.