Whether your selling cars, shoes, or ideas, you can't convince someone to buy your product by using something AGAINST them.
Sorry to be so cyncial, but why should they worry? They're not trying to sell; they're trying to lobby. There's a big difference between the two. In order to make a sale, you have to convince someone to part with money - typically, their own or funds over which they're responsible - for whatever it is you're selling. Lobbyists don't have to do that. They have to convince politicians, and/or bureaucrats, to do something for (or to) someone else.
As long as politics is adversarial, which it is, that bad sales strategy will not be bad for lobbying. As you know, a sale isn't made by saying "buy this and you'll really get back at those so-and-sos that have been cutting into you." On the other hand, laws and/or regulations are often passed using that technique. Once it gets to the politicians and/or bureaucrats, it morphs into "You will save those poor people from the depradations of those so-and-so's. You can smite the wicked!"
From this angle, selling is actually cleaner.
One more point: the AGW lobbyists-with-degrees don't even need to hustle the politicians and/or bureaucrats. They just need to hustle the public-school teachers. That's what "the long march through the institutions" is all about. All ya need is a plausible-sounding high ground, and it's a'rollin'. The absurdities of yesterday become the "impractical idealism" of today and the base for coercive measures tomorrow.
After all, who would sit down with his kid and say something that has a real chance of inducing the kid to blow off his studies? What youngster would be reckless enough to have an "F in indoctrination" dogging his transcript? [Feel free to substitute "her" is appropriate.]