I refuse to accept this idea that a person must be either pro-hysteria or pro-legalization.

Well, I haven't seen you come out against the hysteria when fueled by the likes of Nickerson.

My argument is based on cost/benefit analysis, so individual cases have no bearing.

If that was true, you'd have shown your model and not relied on claims of alleged abuse found on the internet.

I think there are a lot more men who would take advantage of girls

You have presented no evidence as to why, nor of the probability of finding such men. Do you believe the vast majority, say 99%, of girl loving pedophiles are would-be rapists? Analogously, are most men attracted to adult women (including those a nano-second over the magic age) would-be rapists?

On balance, adult-girl relationships are going to be far more often exploitative than all lovey and wonderful. I note the exclusive pedophile whose sexual satisfaction relies on deciding that the girl really wants to do sexual things with him, and how this is likely to cloud his judgment.

Unsupported arbitrary value-judgements and an ad hominem attack!
I'm confused: Does supporting anti-pedophilia, including genocide, imply a lack of bias? Is your dehumanization of exclusives also based on some alleged analysis of cost?