Your figures indicate you went by Umpire's "terrible 25%" when Chinamigarden actually posted 25% were "middling to darn right poor." The percentage of right calls should be above 75%.Let's think about this for a minute...
If 75% of the umpires know their stuff, and 25% don't (your figures), then wouldn't the correct call be made on these plays 75% of the time?
Why would parents- or anyone, for that matter- assume that the ruling made 75% of the time is the wrong one, while the ruling made 25% of the time is the right one?
If your figures and reasoning are accurate, I can draw only one conclusion: Parents are nuts!
What you should have taken from Umpire's post was his question about the experience level of the umpires and married it with your personal knowledge of where the least experienced umpires work. The umpiring is typically poorest when the kids first start playing at the younger rec levels, so the bad calls happen at a much higher rate there. The coaches and parents are also the least experienced there, so it is a breeding ground for perpetuating and spreading misunderstandings of the rules. Over time, umpires and parents become more knowledgeable of the rules.