It is interesting. These recently coined terms such as "social justice warrior" and "white knight" seem to be used as linguistic magic wands. Powerful spells the mere invocation of which should poison the well of ones opponent. Much like some earlier terms tiredly bandied about by those of a different political bent.
SJW is just the current word we use for communists and leftist political agitators. They are sophists who use word games to confuse their opponents, but if you see them for what they are and clearly point it out they got nothing. Like a hairless Samson. Hence the lovely "drop dead" I acquired a few posts up.