I have absolutely read the rulebook and I absolutely know what the rule states
and the spirit of the rule. I've called my fair share of baseball games and have called more than one infield fly. I'll also ignore the fact you are a Cardinals fan and obviously there is a bias where you would say "of course the call was correct, it was in our favor and against Atlanta..." But I digress...
The rule states with runners on at least first and second, less than two outs, if a fly ball is hit and an infielder can catch it WITH ORDINARY EFFORT, then the batter is automatically out (runners can also advance if they tag up). The spirit of the rule is to prevent a dropped ball from getting forceouts at more than one bag because the runners are forced to tag up (an unfair advantage, which I will discuss later).
There are some clear things wrong with that call:
1. What "ordinary effort" causes the shortstop to run halfway out into the outfield to ATTEMPT to catch a fly ball?
2. The left fielder used more "ordinary effort" to get in a position to make the play, but was waved off by the shortstop hauling *** backward, who in turn thought the left fielder had the play
3. The ball was dropped because of a miscommunication by the players as to who had the play.
4. 95% of the time, that is scored an F7 because the left fielder makes that play
5. The outfield umpire called it... not the third base or second base umpire, not the home plate umpire... the outfield umpire... which the point should also be made the ball dropped PASSED him, well beyond the infield.
6. Where else in the history of baseball was that the call made in that situation? Please show me. Runners at first and second with less than two outs is a fairly common situation and SHIRLEY there has been a fly ball somewhere in that vicinity as that one. Show me where the precedent is to call an infield fly. 5-10 ft beyond the dirt, I've seen those called before. 60 ft in the outfield? No way.
Just because an infielder has a CHANCE to make that play, doesn't mean it's an infield fly. What advantage would St. Louis even gain from dropping that? O, I know... Bases loaded and 1 out... no force outs even remotely could have been taken advantage of because of the drop (MAYBE third).
Because the call went in favor of your Cardinals, doesn't mean it was the right call. I am a baseball purist at heart. Hell, I was pissed 2 years ago when the braves beat the Pirates in 19 innings on a blown call at the plate, and I'm a damn braves fan. It absolutely was the wrong call.