This is HackerNews. Either the top comment will support TFA and replies will refute the top comment, or the top comment will refute TFA. I can't think of a major story where that wasn't the case. That's kinda the shtick here.
Not just the top comments. Replies that agree are fairly rare here in general.
Personally I think that's good. Replies that agree rarely add new information, but they drown out other more informative comments and can create an echo chamber.
Exactly true. It’s the fact that people think top comment means something is more accurate when all it means is it was most voted. That’s like saying Trump is always right because he got the most votes in 2016. Every website is the same, likes or upvotes are literally a popularity contest and what is popular, usually the first couple comments and the comment that mostly closely meets already widely held expectations. Anyone who is an expert or knowledgeable in any field can attest that often, but not always, the top comment on a topic is wrong and the best comment sits 4 replies deep with almost no upvotes.