But on good sites, absolutely! I'd consider comment sections more valuable than the news content, which is often an AP repost with a couple more sentences.
What news site is this? For general news sites, I've found them to be of very low quality. I can't remember the last time I gained anything from them.
If you're in the US, as an exercise, look up the news site of your local newspaper, and read the comments there. They're often of higher quality than the larger state/national news sites, and even then they're mostly crap.
Most news sources however have three primary functions: Identify, Write, and Publish news.
Commenting in HN is key to its existence; Commenting in news sources just happens to be a thing available.
Saying that comments works in HN is like saying comments work on reddit; it's trivially true, assuming the site is in any way functional/popular. But that doesn't mean comments are useful on NYT; take away comments and there really wouldn't be much lost from its primary goals.
(Inside pissing out instead of outside pissing in, as the phrase goes. Until they go away or whatever, that's another day's problem.)
What is happening right now pits one fragment of the population against another aka polarization, that's a harbinger of a possible civil war, not of a revolution.