Teenagers will get and drink alcohol regardless of laws...so why bother having any laws? People will drive drunk - no matter what if they feel like it so...why have controls on it? People will drive any speed they want - no matter if there are speed limits. Make all the speed limits you want...guy wants to speed...he or she will.
The hallmark of a civilization is the willingness and will to establish rules and standards of behavior - even if some people will break the laws nonetheless.
Just saying.....
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