That children are not capable of giving informed consent is a scientific fact, as well as a basic principle of jurisprudence.
And NAMBLA is of course trying to push the envelope and expand these two concepts for their own benefit.
Present their studies as scientific fact, and
Change the jurisprudence.
In truth, they are hiding in the shadows and pounce upon our culture.
Scientific studies and jurispurdence will NOT convince or stop them. They must stop themselves, based upon a revelation of a higher morality than themselves. Be it the surrounding culture or government. But where does it boil down to?
God and the Decalogue. "Why the Law then? It was added because of transgressions...but the Scripture shut up all men under sin...therefore the Law has become our tutor to lead us to Messiah" and the need for a Savior that we may live by faith in life, as opposed to under each of our own laws (or God's law). I am "not under Law but in grace".
In fact, it's in the states with the highest level of religious observance that we find the lowest ages of consent. You can get married in Kansas, where creationists won their most recent victory, at the age of 12. So who is pushing the envelope?