That's easy. NAMBLA advocates a victimization (statutory rape of a minor, at minimum). This is a huge difference from any gay advocacy group, as "gay" doesn't victimize anyone, hell it really doesn't even involve sex. A celibate gay person is still gay. Being against NAMBLA is the same as being against the National Association for Murdering Elderly Women (NAMEW, not so catchy... but heck). A person being against the victimization of another human being has a rational reason to be against it. Without a rational reason for being against something (ie, something between two adults with no actual impact on your life), then you're just meddling and a person has to question why you care so much.
At least that's my view on it.
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victor809 wrote: