That's critical. My YouTube rule these days is to block any channel with a video name or thumbnail that says something like "This is why you fail at XYZ" or other statements designed to evoke an emotional response from me. And on top of that, I try to only click on videos where the title/thumbnail is properly informative, exposing the content rather than trying to hide it behind a vague hook. Hooks like "You won't believe this one trick!" and fluff like that, titles/thumbnails that should introduce the trick, not just allude to it.