I do think there is a larger cultural context here, which is that our society is very inconsistent around teen sexuality, and especially teen girl sexuality, in general.
The thing is we can't treat teens just like kids, they are starting to mature, and are interested in sex in many cases. So protecting them from becoming victims has to be done in ways that take that into account. Like actually teaching them what a healthy sexuality would look like, but also old fashioned things like not giving themselves away to cheaply. To modern ears that sounds horribly anti-sex and puritanical, but not putting value on themselves is a big part of what makes these girls vulnerable.
I think we are altogether to blase about underage sex, in terms of giving kids access to things like hormonal birth control and abortion, without parental involvement. The attitude described in several posts about seeing these girls as just expressing their sexual agency - that is exactly what many health care providers, including in schools, are taught about dealing with teenagers. They are not quizzing girls on their sexual choices, or worrying they aren't old enough to know what they are doing, they are just writing them a bc prescription.
I have a friend who was "groomed" as a 15 year old. Except the boy was only just 17, so not actually considered too old as such, and not sharing her around. Just abusive. She's now in her 40s very skeptical about much of the received wisdom around medical access for teen girls - she strongly feels that had her parents known she had two abortions that year, and eventually was on bc, they might have realized what was going on and intervened.
Of course this will probably be immediately rejected by many as anti-feminist thinking, as medical access for minors is considered something of a dogma, but I think when you look at how authorities treated these girls in terms of supposedly being in control of their sexual behavior, it's not so different in kind to how they are taught to treat sexual behavior in other younger teens.