This is a problem with any upvote/downvote based site, in my experience. It only takes a couple people who are highly engaged and who have a lot of free time to refresh the comment section and downvote everyone who disagrees with them.
Some times I’ll write a polite and well-sourced comment correcting some misinformation here and the comment will go to -2 or -3 when I check back in 10 minutes. Information that goes against the angry narrative du jour is often not welcome. Later, as calmer heads read the article and peruse the comments the downvotes start to get balanced out and the comment might rise, but some times the first wave downvoters are aggressive enough to get the comment downvoted into gray text before it has a chance to be seen.
In my experience with other communities, it only takes 3-5 people with a lot of free time to crush conversations they don't like. On a fast moving comment section a wrongthink comment can be buried into the bottom half of the comments with only a few early downvotes.