But the value in these forums are enormous, and helps saving lives. That knowledge doesn't stale either.
Most libertarian groups and pages I know affiliated with the 'boogaloo' movement caught a ban
Most of the pro-trump pages I know caught a ban, as well as pro-trump groups involved in on the ground activism
A few left anarchist groups I was in caught a ban.
It wasn't so much 'purge of the right', there's always a low-level purge of right wing pages going on, either because of moderator bias, or simply because leftists and/or liberals spend more of their free time infiltrating groups and reporting right wing content than vise-versa.
Rather, it struck me as an attempt to suppress protests and potential violence in the streets on either side of the political divide in the days subsequent to the election.
I do think it is unfortunate for these groups to be giving their data to Facebook. I heard a wild rumour that FB was doing a purge of some sort on right wing political groups. Gauging the truth of something like that from a distance is impossible, but it did raise the point to me that if your private group was kicked off Facebook there probably isn't a way to take your post history with you.