he has been an idiot, there's no question about that. but tbh I do think that to class the girl as vulnerable and a victim is a bit disingenuous.
There are plenty of threads on mn where people talk about their 15 year olds wanting to have sex, and how at 15 they are not necessarily too young to do so and to talk about safe sex etc. How we should understand that teens will have sex whether we discourage that or not - I've seen these types of comments made about kids as young as 13, and tbh as a rule the emphasis seems to be on girls - why is that?
At 15 she may well believe she is in love.If she'd gone off with a 16 or 17 year old people would be saying they were both teens and that the law needed to go softly on him.
As her teacher he is the one who should have slammed on the breaks and never allowed things to develop, he has abused his power and should rightly be held accountable for that.
But as a 15 year old girl I don't think we should necessarily just write her off as an innocent victim who wasn't in control of her feelings and emotions - at 15 girls do generally know what they want.
It is IMO possible to condemn his actions while at the same time still acknowledging that being 15 doesn't necessarily make her a victim incapable of doing anything about the situation.