I have to respectfully return the spit-take on these.
Don't like the umpires making calls ... neither do the parents.
Put in everything ... except that stuff.
None of that is what I said though.
I don't want the umpires making up calls. And when it comes to enforcing literal unwritten rules, that's what it is. That's not judgment. "Did this pitch enter the strike zone?" is judgment. "Does this vague act constitute violating the 'spirit of the rule,' a concept that's not actually defined anywhere" is just making stuff up.
It would be very easy to create a list of "unsporting acts" that covers 95% of the stuff people think should be covered. Maybe more. And if people didn't think of it, I bet it's not that bad.
It's actually insane to me that, as an umpire, you'd rather have to rule on nebulous abstractions (did I just say the same thing twice?) than actual concrete rules. Imagine if the strike zone was described in the rules as "Any pitch that, in the umpire's judgment, was a good pitch, believed to be of the hittable variety, may be deemed a strike if the umpire so chooses." That's what some of this "spirit of the game" nonsense is. It's the difference between judgment and opinion.