jbaldy22:
I am surprised at an assumption in your comment. The law does not hint to permitted drunkeness at any age or with religion as an excuse. Rather it seeks to place responsibility to prevent alcohol use by someone who is less likely to know limits for safe drinking. From the problems among adults, which are even frightening for frum community, it is crtical to insure that young people do not go down that path.
As far as rabbeiim and roshei yeshivos being in favor of shikrus, I beg to differ. Most are not agreeable to it, and actually find this trend abhorrent. You are correct that there are those who turn a blind eye, and do not prevent it.
One of the major yeshivos in Brooklyn has paid security guards by the doors on Purim night. They are bouncers to stop those already drunk from entering, and they search entrants to be sure they are not bringing in more alcohol or drugs.
Lastly, no government cares about Purim to write legislation about it. The laws about alcohol and minors is as relevant and needed for the gentile as for the Jew. I would hope that all Yidden, everywhere, and of all ages, exercise good judgment in drinking on Purim, and refrain completely from the shikrus that is dangerous, and certainly not the halacha of ad delo yoda.