I don't think its just an organised group. I do believe that MN has, particularly at certain times, been the target of the troll farms for political reasons.
However I also believe there are women who genuinely think like this.
Sometimes its to hold power over other women. Sometimes its to suppress the reality of their own experiences.
Its nicer and easier for some to say they've been empowered and taken advantage of men for their own gain, than admit to the uncomfortable reality.
I'd also say that there are plenty of male users who are not MRAs. The tone of some posts on here towards men are unhelpful in helping us stop some of this abhorrent behaviour as it tries to create men as the enemy. That's too simplist.
The other thing is that certain threads - particularly controversial ones - have a tendency to attract particular people more than others. You end up with the other end of the extreme flocking to it. Certain threads can and will give a distorted picture for that reason. It also depends on which section of the forum the post is in.
Just keep on getting the message out. If the message is strong and valid enough, and people communicate it well, others will get on board and time will change things. Perhaps slower than we like, but few meaningful changes happen over night but through slow progress and a series of key events rather than single ones.