[1]: https://en.wikipedia.org/wiki/Wikipedia:No_original_research...
Even though it's one of the biggest online platforms, it's still a niche demographic. It's pockmarked by enough differing opinions that you can feel like it's a good representation, but the US has 320 million people in it, and it's hard to find concrete stats but it seems there are around 30-45 million US reddit users. Only some of them would comment on any particular topic, so what you're reading is a curated voice of a particular demographic self selecting their participation in various topics.
As a microcosm of this, checkout the Motorcycle subreddit. You'd be fooled into thinking everyone rides with full leathers and helmets on, and that the entire motorcycle community feels really strongly about it, and that it's a rare sight to see someone without gear on. But it's extremely common to see people riding without full gear in the real world.
That's why all these big political shakeups take that bubble by surprise. Reddit didn't think Brexit could happen, they didn't think Trump 2016 would happen, and it doesn't matter what your political flavours are, my conclusion is that Reddit as a hive mind doesn't really have that good of a grasp of reality.
Because the fervor doesn't match what I see in real life, I really do wonder how much of what's happening reflects actual public sentiment, and how much of it is the result of more subtle, nefarious things at play.
I recently found a Wikipedia article where some media organization had published an interview with a public entertainer, only rather than linking to this interview, the Wikipedia article in an attempt to cite a reference for the entertainer's quote linked instead to a Vox article that was, in consideration of prosaic matters alone, much worse than the original source. Of course it was really heavy-handed, too, and overstuffed with "implied 'we'". How did that happen, that piece getting linked in place of the original? Was it the result of laziness, ignorance, or something more intentional? I didn't dive into it (too much of a quagmire to try to wade in and correct it, either), but I wouldn't doubt if there was some monetary cause related to the big business of politics. It's certainly happening in other places.