Yup. If I'm watching a positive review of a [insert-object] I'm planning on buying and it has 10k likes visible while hiding 2k dislikes I'm probably going to get horribly misled.

While if it's a video of a political debate I would expect there to be a ton of dislikes by default, so I suppose it wouldn't matter much in that scenario.

And in howto/explanation-videos, if dislikes aren't shown, there's no signal for people telling them whether or not it's a good explanation.

I suppose you could devise a dislike count yourself by calculating the likes/views ratio. But why... people are deliberately putting their content up publicly for display and as such are opening themselves up for scrutiny/criticism/dislikes. It can't be all praise and hugs and kisses. That's how we treat children.