There's a trick to it: Whenever an author says "No doubt" or similar, there are doubts the author can't answer. It's a rhetorical sleight-of-hand, something to

There's a trick to it: Whenever an author says "No doubt" or similar, there are doubts the author can't answer. It's a rhetorical sleight-of-hand, something to get you looking over here while the hole in their logic slips quietly past over there. Do it deftly enough and you can get people to swallow camels in your article, even if they'd strain at gnats in an article written without such devices.