HiroshiMishima: The notion that "I'm the father, I can do what I want, say what I want, and until you turn 18 you're my property and will do what you're told." is by far some of the most offensive logic I've ever seen as a parent. Nevermind that many parents actually still believe their children should bend to their will after they've hit 18, it's one of the reasons so many kids move out as soon as they can.
First of all, you must have failed to watch the video, he discharged the gun at a steep angle at a laptop sitting on a lawn outside. He wasn't irresponsible in the way he discharged the gun in the least (not debating whether he had a good reason to discharge it, just saying he did so in a safe manner).
Given that you seem to not even have watched the video I somewhat question the utility of even responding to the quoted part above but here we go:
I don't care if a kid wants to stretch their wings, that's fine, and it's fine with most parents. The part you're taking issue with is usually simply a childlike overreaction to parents reasonably saying, "No, there are limits, you are crossing them, no debate on this one, too bad." That's both legal and reasonable. Likewise, as a parent, you're pretty much legally and financially responsible for most of the actions of your special little snowflake. So you're saying you don't think the person who is not only responsible for nearly 100% of their upkeep and is legally responsible for their actions can't say "No, sorry, you don't do that!"? I guess I see why a 16 year old would think that, I'm not sure why an adult would.
Kids, have limits to everything, including privacy and freedom of action. That's not to say they don't have plenty of freedom as well, but the liberties are earned and can and will be revoked as needed to make sure the kid doesn't kill themselves or otherwise seriously fuck up. Heck, revoking them just to say, "You do not have the right to shit on everyone around you," is perfectly reasonable as well.
No one wants a slave for a kid, as you posit (or the number who do are so vanishingly small that it's not even worth debating), if they did they could save the money it costs to raise a kid and hire a servant instead.