the important idea is that exfj are capable of madness. it's hard to orientate in the world and form a coherent self, for a child with dominant Fe, under certain circumstances. i have personally never seen an evil hitler type of enfj, but i have seen the most obstinate behavior of confused enfj in the below 100 IQ range. and with those, it's never about them or just anyone but always about a higher cause and a principle and thus the whole world. they don't like to do it below ghandi like dimensions. i mean, that's how they are feeling about the principal importance of their mission. (not saying anything about ghandis type, btw). for instance, when they choose to serve supper for the poor of their neighborhood (how evil, right?), its the dawn of a new era.
I've seen ENFJs utterly ruin a person in one fell swoop. And then I've also seen an ENFJ help a person when no one else would. With Fe dominants, you never know what you'll get. They can be pretty vicious and plain paranoid. Still, ENFJ is one of my favorite types because when they are good they are really great