)
Especially when one side is something as unusual as a validation of selfishness. (We Westerners can do "be yourself" when it's a rebellion against opressive conformity, but taking it further is tricky.)
As for Rainbow...well, she's one of the most flawed Manes (and also the most masculine - the early show had some issues with that). Left to her own devices, she might well become Gilda or Lightning Dust - her loyalty, both to friends and to ideals, is what keeps her flawed nature in check. Maybe.