It's also a common technique among teachers, because teachers are not trying to persuade skeptics. You are presenting it as some kind of manipulation, but it's really just a different audience. And it's a lot easier to read the straightforward style, and learn a lot of stuff quickly.

His conclusions are not really the most important thing about his writing, anyway. He brings forward a lot of good approaches that are an improvement over other common approaches. For instance, he avoids grouping people by a snapshot in time, and instead analyzes them over their lifetime, or even generations.

And he also just asks a lot of interesting questions and dives into the data and finds interesting results.

He's also less US-centric than many writers. Sometimes that alone is enough to advance the conversation by breaking us our of our bubble.

Personally, I prefer my teachers with some humility and the ability to admit that they're sometimes wrong.

You’d like Sowell then. He has done a complete 180 and completely changed his views as he learned more.

Not just right-wing. I've seen the same approach from marxists. (Not an exaggeration or a projection - from literal marxists.) The unstated, unproven assumption is that Marx was right, and the analysis proceeds from there to make dogmatic statements about the economy and/or society. That's fine, if the readers are also convinced marxists. But if someone else reads it, they very quickly think "Wait a minute, I don't agree with your premise, and you did nothing to convince me. Why should I believe your conclusions?"

If you're familiar with Lakoff you'll know there's a difference in tone which is based on a difference on associated family positioning.

Conservatives tend to paternalism. Marxists are more likely to be oppositional, because Marxism and socialism are underdog discourses, and they don't have the advantage of assuming that general readers will agree - especially in the US, where the default position for most of the population is aggressive hostility towards Socialism and incandescent fury towards Marxism, without really knowing much about either.

That may be true. But in response, they should write differently. If you're the underdog discourse, don't start the conversation by assuming that you're right. Worse, don't start it by assuming that the reader agrees that you're right.