part of this phenomenon is random chance. part of it is subjective officiating. the NBA needs to do a better job of ensuring each ref calls the game the same way. capers may interpret the rules in a way that favors harden's style of play. foster clearly interprets the game in a way that makes fouling harden legal.
Newsflash: ALL FANS THINK THE REFS SCREW THEM OVER. Believe it or not, that’s statistically impossible.