Is any textbook or mainstream economist any different?
Hazlitt is responding to other people's economic claims and refuting them with his own reasoning from an Austrian perspective. Chances are the reader already believes a lot of the errors pointed out by Hazlitt in the book so Hazlitt doesn't really need to get lip service to ideas that politicians and mainstream economists promote without a second thought about it.
actually, plenty of economics textbooks present alternative schools of thought and relative merits of those ideas. i think that's pretty standard for textbooks
Hazlitt is responding to other people's economic claims and refuting them with his own reasoning from an Austrian perspective. Chances are the reader already believes a lot of the errors pointed out by Hazlitt in the book so Hazlitt doesn't really need to get lip service to ideas that politicians and mainstream economists promote without a second thought about it.