I saw the post, and I partially agree with you.
Had he done that in her inbox and she told us, I'd be the first one to report him to the cops.
But he didn't. He did it publicly for all to see, he didn't say that he wants to see her masturbate, he didn't flirt, he didn't try to groom her.
And maybe, just maybe, he actually forgot he was talking to a 16yr old.... Besides.... What's a 16yr old doing in a thread about sex eh?
And how come this site allows topics like this available to kids hmm?