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Actually, if it were up to me, things like alcohol, smoking, etc. would all be banned.
Personally, we have enough things you can buy to mess up your health, fast food being one of these things but atleast with fast food you won't get an irresponsible person consume it and then take someone else' life because they think they can handle driving or whatever.
Basically, things like that can be harmful to more than just the person who actually chooses to use it.

But hey, these are only my own thoughts.

The only difference is that I would kill if my rules were broken.

I'd rule through terror and through terror I'd gain respect.

I would say yes, just as i would say yes to making marijuana legal. My point is this. In Europe the drinking age is lower and so is the cases of drunk driving accidents. The fact that it's 21 is supposed to be scientifically well, because at that age a person's brain is almost fully developed (Depending on Gender and race). But the fact is Teenagers in the US are still going to drink before the right age, so you might as well allow them so that they do it responsibly not.
"Aw dude Timmy's having a kegger at his place! I'm gonna get trashed then run his little sister over when I can't tell which side of the road i'm supposed to be on!"

I may be overreacting, but it's just my thought.

Someone *I'm to lazy to look up specifically who* in this forum who lives in Europe pointed out they teach their kids how to drink responsibly. Like, small glass of wine with dinner. Here in the States, I see no sign of such an education. The most we teach kids is to not drive drunk, and even that doesn't seem to stick sometimes. Here, kids binge drink, which IS dangerous to their brain developement. That goes for everyone, not just teens. No, I'm not going to cite that because I don't remember where I saw it.
If there was a way to ensure it'd be done in moderation, I'd say do what you want. But because binge drinking is the popular thing, I think the 21 limit is the smartest option. But that's just my opinion. Don't like, get over it. That's all I have to say.

It's an idea from someone who dosn't care for the human race anymore.

You make everything sound too complicated.
The only reason why that wouldn't work is because people naturally don't like to follow rules and will fight against if possible the only real way to stop it would be to end the person altogether.
But because of this method, a coup d'état would be imminent.

Assassination is out of question, if I were to take over in such a way, I would only have the most loyal be by my side, this said, if I were to die, who's to say someone worse won't fill my place?
It's not a good idea to do things in this way, but the world isn't much better now.
If it's not the government being brutal it's the people under it.

There's more to be said, but it is especially unseemly for a crew member to derail a topic.

I will say on the thought of topic, that I really cannot say anything in support of the ages that our country has chosen. A boy or girl is trusted to guide around a few tons of steel at speeds up to 60 miles per hour for two full years before some states allow them to decide who they want to take to bed. It is absolutely baffling.
As for drinking, though, I have little to say against the age limit in regard to alcohol. I took my first drink about a week before my 21st birthday and can definitely say that I didn't need it significantly sooner.