I didn't say anything like that.
I said that sexual attraction at a basic level is attached to physical signs of sexual fertility. Sexual attraction happens really fast, and unconsciously, it responds to very basic physical cues. Usually someone at 9 won't trigger them, but someone who is 14 might well.
None of that means it's ok to have sex with someone who is nine, or 14. It means that we rely on the more developed parts of the human brain to tell them what is the right way to deal with this kind of feeling. Because it will happen, we can't change these basic elements of human biology like responding to visual cues or pheromones. So we need strong social taboos, that are consistent, maybe different kinds of signals that certain young women/girls are still off limits, young men need to learn, practically, what to do with sexual feelings that are inappropriate, there needs to be social scaffolding that creates the behaviours we want. Because in any population there are some people that are less able to think clearly, who have less self-control, and so on. We need to make the sense that certain behaviours are not ok as strong as possible.
Telling ourselves that it's abnormal for a male to have a sexual attraction to a young teen just makes it all the more likely that society won't take effective approaches to suppressing that sort of behaviour.
And actually, I don't think our society is particularly good at that. We give seriously mixed signals about sexual desire generally, we don't seem to try and avoid the sexualization of quite young girls, and we don't cultivate the ability of young people, and in this case specifically young men, to resist immediate urges.