The Ashley Madison scam is not really that different from selling bogus cures to baldness, snoring, erectile disfunction, or cancer, or promising Russian brides, or bogus kickstarter projects (you can usually sport these, but someone must think they are worth doing). The internet can reach people in such numbers that it is even worth posting 'you won't believe..' set of pictures (usually photoshopped) for the tiny advertising rewards. We can either say that this is natural way of things: that the cunning should rip off the dumb, or we can do something about it.
In this particular case, Ashley Madison claimed to have a sex ratio of about 1:6, which might make it compatible with reputable dating agencies. However, it is not likely that there are millions of Smoking Hot Babes Just Waiting For You out there. If Ashley Madison once had one good-looking lady on the books, the AM sysadmin would have got her first. It is not only likely that the Ashley Madison scheme is just as reported, it is almost impossible that it could have been anything else. There might be a real site somewhere, but it is so much more efficient to be a scam.
Ashley Madison is perhaps not a proper subject for schools. However, schools do try to encourage smaller children to be nice to each other, and cautious of strangers. It might be sensible to introduce them to the net alongside instructive examples of pictures that aren't real (Snopes tear-down of the sharks in the flooded mall picture), offers that are too good to be true (pyramid schemes), how to know the person you e-mail is a real person (meet Eliza), and so on. I think this would make most children more aware of what might be happening on the other side of the screen; and it might even discourage the few who might be tempted to run scams when they see how little the returns must be.