Whilst I shan't be sad to see one particular group crawling with neo-nazis and nazi apologists be purged, I'm sure that this will be done with the typical Facebook tone-deaf ham-handedness which means that one or two objectionable sites will result in the loss of many dozens of useful groups.
That said, I'll admit that I disapprove of Facebook shutting down groups not actively engaged in/planning illegal activities. I'm no fan of such vile pages, but it only adds fuel to the fire and in a way justifies the views of those, shall we say, "unenlightened sorts".
I fear this may also be indicative of a problem for miniature wargaming, being that it is so small and unknown to the general public that it has no platform to resist such actions against it.