I mean, there are trolls on Reddit to be fair, it's not terribly surprising that if a lot of Reddit users move to some place, a bunch of trolls will come with, either because they too don't like reddit's changes, or because they see new communities to mess with. And I can imagine that, if someone is a troll and gets enjoyment out of bothering people and causing anger, that a community that is pretty restrictive in it's rules and tries to maintain a "calm" and "safe" sort of vibe is probably going to be a more satisfying target?

Beyond that, I do think I recall seeing one of the beehaw admins saying something about not wanting theirs to be the place all the redditors move to, because they don't want keeping the community run and moderated to be a full time thing and because they want quality over quantity, in terms of their community. If they feel like they're reaching the limit of how big a community they can comfortably handle and dont want it getting much bigger, then a controversial move like this that might lose them some users isn't going to be a problem for them.

I'm not saying I like this move, I don't personally have any real stake in it obviously not being hosted on either instance involved but I worry that fragmentation like this while people are starting to really look into the platform as a whole isn't a great look for lemmy, -but I do get where they are coming from.