It's this for thought:
When in 2011 did you start watching wrestling, out of curiosity?
The point which has so strangely eluded you is that the referees are not in fact actual referees of a sporting competition, nor are they characters in need of development so we the audience can connect with them. They're props for the storyline, scenario. Heels need to cheat, and quite often, they need to get away with cheating. The number of ways heels can cheat in the context of an ordinary match is limited, and a distracted or out -of-position referee is one of those ways.
If wrestling was real, yes, refs would catch onto this, but the point about the Irish whip was, that it's wrestling, don't take it so seriously. Honestly, if you're gonna be bothered by unreality in professional wrestling, I don't know if WWE television is for you, but moreover I don't know how it's refs not catching heels cheating that sticks out at you as somehow being unusually unreal for the show?