Is like Shinsou with his brainwashing. He was born with a quirk only Gillian's could use. Toga was born with a quirk which is similar, making her the outcast of society. She just didn't believe that she could take a more vigilante route and decided to stay in the shadows of society.
the difference is that she has no self control. Shinsoo has a stigma against his power but never hurt anyone. Toga is actually a danger to society. She could have found some way to supply her need for blood in reasonable quantities and not attack her class mate and drink him like a juice box.
The thing is that she probably has a thirst for blood, almost like a vampire, and yes she has no control, but her parents decided to "seal off" the quirk and not help her with it
meh. seems like I'm not connected to the recent chapters but the hero norm society is liken to beauty pagent, we only admire what is beautiful and if you are weird and outside our common experience we don't know how to handle them and those that are the first will experience the brunt of society's failure. and they have no problem to share their misery.