seen low strike calls forever. And anytime you have 2 strikes, every batter is forced to swing at anything close, just to protect the plate. It's the batter's job to protect the plate. Not the umpire. I think it's been going on for over 100 years.
To have a "blame the ump " attitude like Harper has is fun to watch but fruitless for him.
Also, there are 2 minutes and 15 seconds between innings. Not much discretionary time to waste standing there.