Don't join NAMBLA. For a variety of reasons, actually. But add to your list the fact that at least some of your NAMBLA colleagues may actually be cops wearing a wire. So when you arrange trips with them to foreign countries to "meet" little boys, they'll bust you when you get off the plane in San Diego.
At which point you'll be sentenced to three-plus years in prison, and when to appeal to the Ninth Circuit, your panel will consist of Judges Hall, O'Scannlain, and Callahan. I needn't tell you the result thereafter, do I?