The thing is, the manipulation very often starts with the false idea of safety.
Groomers will put up a friendly face for the most part, letting people become friendly and trust them.
Then, when people let their guard down, the actions of grooming occur. At this point, the victim believes they are equals as the relationship has gone thus far, but the groomer was just faking that to drop the act. To them, all their victims are expendable and they never have emotions or sympathy to them.
Saying no isn’t an option to the victim. They believe this is the person that they could spend their whole life with, with true love. They think that what they’re being told to do is just this person’s way of affection. This is why expositions happen months after the inciting incident. Because they don’t realize that anything wrong has occurred.
Now, I can see your point. There are some cases where the victim is just a really f**king horny kid who knows what they’re getting into. But that isn’t an excuse. They’re still traumatized by these events. And if I was groomed, the last thing I’d want is people just ignoring the situation because it was something I could have avoided if I wasn’t being manipulated. You’re allowed to feel that way, and no doubt there is truth to that, but keep those feelings to yourself when you’re talking straight to a person traumatized by these sorts of things.