Like I said, many of us use like/dislike ratios to gain insight into quality of content; whether or not that was the intended use of the feature is really irrelevant.
You're massively overstating the incidence of brigading. A tiny fraction of videos have experienced this. The idea that brigading is significantly affecting user recommendations and even causing them to align is hyperbolic nonsense.
I have no experience with that channel. What makes you think it is being brigaded? Seems like a very unusual target. Given that it's well-used tracks that appear to be affected, it seems to me that it may just be attracting a greater breadth of viewers - who are generally less familiar with the content and may have different expectations (and would be just as likely to downvote whether visible or not.)