Combination of groupthink and juvenile tendencies. Someone that can elaborate on their feelings on an issue and put them into words will actually do so, whereas someone with a lesser-developed capacity for putting their thoughts into words will try and shortcut the process by using what words they do know. Since the average SJW type is either prone to bouts of infantilism, an arrested development case, or possibly both, they resort to words you'd hear a ten-year-old using and the emotional manipulation tactics of a child. That's where the groupthink comes in. Since they can't form the proper arguments for themselves, they fall back on the tactics they have either seen others successfully use, or tactics that they have been told will work.