Sorta. Yes, he knew it was wrong. No, he didn’t know it was “put him in prison until he has gray hairs” wrong. Teenagers do even stupider shit than toddlers, at least in terms of the scale of the damage caused. The parents have to face some consequences, too. How does a 14 year old have a high-end 3D printer and the ability to order gun parts without oversight?
Nope. This traces through from the cellular biology to functional MRI and PET studies to behavioral psychology to “common sense.” Teenagers don’t have the same decision-making capability as adults as a population. There are good reasons why there are age-related restrictions to all kinds of grown-up potentially-dangerous things. Science backs this up all the way. If anything, it indicates that 25-ish is probably the best age to demarcate childhood development and adulthood.