Why Is The 21 Drinking Age So Sacred?

Few laws are as uniquely sacred in the USA today as the 21 drinking age laws.  They are essentially a "third rail" of politics, even more so than Social Security.  And yet these laws are widely disobeyed by the vast majority of Americans at some point in their lives.  So what gives?

It clearly cannot be about saving lives, because speed limits would be even more of a matter of life and death, and yet those are never treated even remotely as sacred as the 21 drinking age.  They are openly flouted and scoffed at by most people, and the penalties and enforcement are pretty lax to this day.  The erstwhile national 55 speed limit was in fact mercilessly mocked and gradually weakened until it was ultimately jettisoned in the 1990s despite (ultimately quite accurate) warnings of "blood on the highways".  And even worse, speed limits on other streets, roads, and especially "stroads" have been raised higher as well, with very deadly consequences, and a fortiori for pedestrians and cyclists (hey, remember them?).  Speed kills, even more so than drunk driving these days, and yet, as one commenter noted, we don't have "Mothers Against Fast Driving", we have the Speed Channel instead.  Likewise, distracted driving, especially by smartphones, is at an all-time high, and people just cavalierly LOL it off for the most part.

(It's all fun and games, until they crash right into a kid on a bike, who is killed or maimed.  Not so funny now, is it?)

And even for drunk driving, the current (generous by international standards) blood alcohol limit of 0.08% for people over 21, let alone lowering it to 0.05% (except in Utah), seems to have far less popular support than the 21 drinking age or zero-tolerance laws for people under 21.  

And also, when they cut the federal alcohol taxes in 2018, ostensibly to boost the economy, there were few voices against it, and even those voices were far more muffled than to they would have been if they had had the temerity to (gasp!) even partially repeal the National Minimum Drinking Age Act of 1984.  So the drinking age is not even entirely about alcohol per se then, even if there is clearly some neo-prohibitionist impulse involved as well.

Thus, we can conclude that the 21 drinking age is really about power and control, along with an irrational fear of young people.  Which of course dovetails with being comparatively lax with the privileged age group that is currently in power, as tyranny is always whimsical.  And now the proverbial emperor is naked for all to see.