well... the way I see it, you have two options.
#1. Grab a shovel and ask him to come help you dig a ditch.... out in the country, or desert. Come back home alone.
#2. take pictures of the literature with his name on it and print up flyers with his photo and address and phone number, as well as his relatives pictures and phone numbers... word it however you want, but post that shit on every telephone pole in the neighborhood, and in every Starbucks, and in the play-zone at every McDonalds, and on the door of every Toys R Us...... post his info and his interest in the NAMBLA on craigslist... and post the pics of the literature with his name on it on Facebook and tag him, and tag his friends and fam............... do this daily for months, until he's found hanging from an extension cord in his garage.
--- I don't call the cops on anybody, for anything, ever. If you want something done, you have to do it yourself. Do society a favor.