While people love to mock SJWs for their timidity and cowardice - their need of 'safe spaces', their mortal fear of intellectual opposition - what many fail to realize is that SJWs consider their frailty a virtue, not a vice.
The inability to encounter an idea without feeling physically ill is considered praiseworthy. Being unable to finish - or even start - a book they disagree with is a sign of moral development. If you're capable of reading things you deeply disagree with without being shaken to your core, the SJW regards you as at best an oddity, and at worst, somehow deficient. And if you regard a Wrongthink book as containing valid points (however few) that don't fit neatly with your own, you are not a thoughtful or open-minded person. You are morally deficient, and quite possibly a threat to everyone else by virtue of what thoughts you're willing to entertain, even if you thoroughly reject them.
In the SJW world, the proper reaction to dissent is not argument, or even rejection. It is stomach-twisting, incapacitated terror.