You clearly don't watch any political videos if the ratios you're seeing are universally that favourable. Almost all mainstream news content was heavily downvoted. More recently content promoting vaccines, LGBT politics, diversity / BLM related topics, etc have all come under significant fire from viewers and is very often downvoted.
I strongly suspect YouTube is having the same problem rotten tomatoes has been having in recent years... In their case we've seen films such as Captain Marvel do very poorly with audiences, while largely receiving praise from critics. What's the problem with that? Well, if you happen to land on a certain side of the culture wars you may start asking if the film's audience review is actually a reflection of the films quality or if it's just a reflection of it being vote bombed by misogynistic trolls. If you think it's the latter then you might feel the need to take action, and in the case of rotten tomatoes you might start altering and deleting audience reviews to ensure the audience score is conforming with what you know to be their true opinion of the film.
I'm not saying YouTube did remove the dislike button for political reasons, but their reasoning for doing so certainly doesn't make any sense. If creators are being harassed by the dislike button they can just disable it as many creators had been doing. And if you disable the dislike button you're only encouraging hate in the comments, which is probably worse for a creators mental health, and already enough of a problem on YouTube as it is. The timing of this move is also extremely suspicious. Nowadays my YouTube homepage seems to be full of mainstream news channels which I haven't subbed too often pushing the mainstream narrative in regards to COVID vaccines or some other hot culture war issue.
Right now I have 6 mainstream media videos being shown on my homepage none of which I have subbed to, 5 of which are COVID related and the other is about Ghislaine Maxwell. I have absolutely no interest in this content, in fact I actively try to avoid the news but YouTube for whatever reason has been pushing these videos onto my feed recently and therefore if I do end up watching them I'm likely not going to enjoy it much and am probably quite likely to downvote them.
I guess I'm not saying big tech have an interest in controlling what information you see and how you perceive it, but it certainly looks a bit suspicious.