I don't disagree with your observation of the general dynamic that you describe as the "grievance industry". Much of the right's success since Reagan has been due to its ability to milk the aggrieved feelings of NASCAR belt whites.
But trying to sidestep ethan's point (or whoever's it was) by blaming the "grievance industry" for prominence of the "controversy" over marriage equality is dumb. Yes, there are lots of trivial "grievances" out there. There are also real, legitimate ones. The incipient "grievance industry" worked against slavery for years. One could even say that the U.S. owes its existence to its characteristic grievance industry. And I assume you'd agree that, post Roe v. Wade, those who favor increasing legal restrictions on abortion are key drivers of the grievance industry?