I can boil that down even further.
Say two people offer to sell you tubes of the same toothpaste, at the same price, and you want to buy a tube of toothpaste.
One of them says “This is good toothpaste at a good price.”
The other says “This toothpaste is better than all other toothpaste, because it will also prevent baldness.”
The conservative inclination of the second pitch is that the pitchman is a goniff. A liar.
The same with salesmen of efficiency light bulbs. They don’t offer a better price or better, more pleasant lighting, or longer lasting bulbs, so they offer something unrelated. “They’re good for the planet!” Yeah, b.s.
I’m reminded of when the Soviet Union first build the Moscow subway. It was really gorgeous and expensive, and a top Soviet official couldn’t wait to drag the American ambassador there to show it off.
Indeed he was impressed, but then he noticed something odd. No subway trains. The truth was that they had spent so much money on the subway, they had none left to build trains with.
So he asked the Russian, “Where are the trains?”
To which he immediately and angrily applied, “But what about the abusive treatment of blacks in the American South!?!”
Yep, when cornered, leftists change the subject.
You don't need a LEFTIST for this ploy.
There are MANY of FR who do the same when their chosen (fill in the blank) snakeoil is not able to defend itself.