Why is it that Stus seem to be tolerated — nay, encouraged — a LOT more than Sues throughout various forms of media even when the men can be just as horribly, annoyingly, perfectly wangsty?
MSP: Because the patriarchy freaking sucks.
I also think it has something to do with how most YA literature is geared towards women. So Stus fit into the mould of “dream guy” so many girls supposedly want, therefore the more perfect a guy is the more women will fall for him and the more books will sell.
And when the book is marketed towards men, then having a Stu as the lead provides extreme escapism because the guy is so perfect he can do anything and have women falling all over him therefore men want to be him.
So yeah basically because patriarchy freaking sucks.