Take the Gillette ad as a great example. No dislike button? Now the “lack of downvotes” can be used to indicate the normalization of such propaganda and imply people support the message.
It is impossible to discuss this without it becoming ideological, and the asymmetry is exactly why it is a massive problem.
The "you made me do this!" tactic is as old as time. In your case, the claim is that YouTube not hosting ignorant anti-vax content, and Biden making a factual claim about the unvaccinated, made people (at least proxies that substantiate your story) not get vaccinated. Therefore, YouTube and Biden are actually to blame!
Nonsense.
I was going to put the cart back in the corral, but then I saw the sign asking me to put the cart back and that offended me because now it's a demand and not a courtesy! The store is to blame that I left it rolling in the lot.
Whatever terrible, selfish thing people do, there is an argument they make where actually it is everyone else's fault.
It seems most people are engaging with YouTube in the same bubbles as any other social media platform.
The "propaganda" videos I see (when searching for them) on YouTube don't have large dislike ratios, they are very much liked by the people who consume that content. An example is PragerU videos.