It is certainly disturbing that there is such a thing as an organized movement of people who want to continuously and openly resent being on the shelf, to the point of advocating violence.
In retrospect, it is also probably predictable. A perhaps unavoidable result of the raising awareness and empowerment of women coupled with the regrettable situations of subservience and passivity that made that empowerment necessary in the first place. It would have been considerably less traumatic if we were not also under a powerful spell of individualism-as-a-virtue; people neglect the very real need of social safety networks and sometimes feel proud of it. Online communities may sometimes be helpful, but this example shows how dangerous they can also be when too insulated, too incestuous.
Anyway, it all goes down to necessary, unavoidable social change. Some people adjust and accept the changes earlier and better than others, and that creates situations of desolation and despair based on self-pity, loss of references, a sense of abandonment.
I see no real response possible besides actually addressing the estrangement and solving it. Those people need better ways of dealing with loneliness and loss. For their own well-being as well as of those who deal with the consequences of their misguidance.