Email might be a good way to alert the broader public about things that have been organised. But for the smaller-scale stuff? For organising what your group's response should be to begin with? That needs to happen either face-to-face (in which case the question becomes: how do you organise a time and place for that) or on real social media. Email just isn't really cut-out for that kind of task. It doesn't have to be corporate social media. Matrix chats or a Friendica group would be just as good in theory. But in practice I've never heard of that actually being done.

And just because you're apparently anti-social or whatever, doesn't mean everyone else is. "Ew." What is it the kids say? "Touch grass"?