Some of you are not too bright.
(Maybe that is how one comes to be called Bubba.)
Only capped bottles allowed in = It is about alcohol, not the throwing hazard.
Now them taking the caps at the stands really is stupid but that is a separate issue.
Hey, thanks for questioning my intelligence. Would you like to know were I got my degree from, my SAT scores, etc? And since you brought it up, "Bubba" is a term of endearment in parts of the country.
I am a rule follower as the cap was on my son's bottle, and we respectfully, though begrudgingly, threw the bottle out. Again, I could have returned to the car, put two sips of water back in the bottle, sealed it up tight, and no one would have known.
If, as you say, its an issue of alcohol consumption, though I understand the concern, discretion and judgment can be used on the officers part. A 9 year old walking in with the red "smiley" face from Gatorade, or an 80 year old woman drinking a bottle, on a day when the temps were over 90 can and should get a "look the other way". If I was walking in with a bunch of my buddies, showing visible signs of excessive consumption, I would understand enforcing the rule.
In the end, it cost me $4 bucks, which is obviously not a big deal. I mentioned these as odd rules with a seemingly lack of logic and inconsistencies in enforcement.