Why is the league a secret. Red hair is becoming increasingly rare in Equestria.

Is it so wrong that ponies who admire scarlet tresses want to see filles like Apple Bloom thrive?

Is it so wrong that their similarities cause Strawberry Sunrise to feel an almost maternal connection with Apple Bloom?

Is it so wrong that a few think she should only date colts a with whom her hair colour would be passed on untarnished?

Is it so wrong that there is a secret plot to change the hair colour of all the princesses?

Okay, maybe a few of those are wrong.
Fine, most to all are wrong.