Atleast he got the knowledge first, now he can use it and not really need the forum.
Regarding the Gun argument, it’s pretty obvious why they have more restriction on handguns than on shotguns/rifles. It’s a lot easier to conceal a handgun. You could walk down the street with a handgun at your waist band and no one would ever know. Now it would be pretty easy to spot someone walking down the street with a rifle.
Now to answer the original topic, the reason why you have to be 18 is because theres explicit content on this site.