90% of the kind of content you’re talking about can be removed by blocking a couple of domains and a handful of users. I believe that they’ve been defederated from most of the larger instances. You will run into a lot of hot takes on lemmy but that’s not too different from reddit.

I think there’s a few reasons why they may be more prominent on lemmy, though. Communities like r/politics took a while to stabilize and had a large and active moderation team that helped remove the most extreme material, and the community itself was large enough that it was representative of a large swath of the US population. Hot takes would often get downvoted into invisibility, which frustrates people who use forums for trolling, and karma could be used to restrict posting. AFAIK those are not qualities or capabilities currently found on lemmy. I haven’t really read the docs - I prefer to just be a user here - but I have seen discussions that indicate that downvotes don’t get tracked as well as suggestions they be removed altogether.

Also, a new technology - especially one associated with sectors of the FOSS community and anti-centralization - are by their nature going to attract an initial user base that skews in certain directions. I think it was Eric Raymond who observed that hackers, politically, tend to be either socialists or libertarians with very little in between. ESR was being a bit tongue in cheek and the hacker culture back then was different than it is now - or rather computer culture as a whole has expanded so much that the old school hacker types form a much smaller percentage.

I think the most problematic part about lemmy which will ultimately limit its adoption is the chaos that comes in from having dozens of communities across dozens of instances that all cover the same topics. It makes discovery much more challenging than it is on Reddit, and it doesn’t help that many of the clients can make it challenging to identify which topics are actually the most used. One of my favorite clients keeps defaulting to ordering by a most recently created timestamp or something - I’m not really sure. It doesn’t have the support to sort or filter by number of users (although it displays the metric).

The other issue is that I end up having to remain on All rather than just my subscriptions because there’s so few users, so I end up with a ton of random anime, for instance, which I can’t effectively block because they’re all posted in new subs that crop up all the time, and I can’t block using wildcards (which would help a lot).

I do hope that between the lemmy devs and the app devs, they can address those issues.