The problem is their utter domination of academia and the media, and incredibly active base of zealots, gives them a profoundly disproportionate ability to control the narrative and wield political and social influence. It's easy to punch far above your weight when you can print off dozens of article saying whatever you want, woozle wikipedia into rewriting the truth to suit your politics, and then dump some screaming violent protestors on people that know they can even get away with assaults and other crimes. I still remember one video of a university protest where an SJW ran up to someone, started screaming accusing him of touching her breast to set him up (both of his hands were out in front of him in the air), and then shoved him off a ~5 foot ledge.
Could you imagine the media response if anyone did that to feminists?