Hockey - penalty shots very rare; refs' influence mostly on calling penalties. And while they make mistakes, a couple bad penalty calls will not influence the game result much.
Football - individual ref calls do not have drastic effect on outcome
Basketball - bad foul call? big deal.
Baseball - calling a ball instead of a strike? bad call at first base? Not a big deal.
Soccer - call a penalty shot (HUGE effect on game result) because of a shirt tug in the box (Italy), miss a couple handballs that assisted a goal (Brazil) [and then ask the player afterwards if it was a handball?
], call back a goal because of a terrible offside call (USA), etc.
You guys should be capping the refs instead of the players.
Football - individual ref calls do not have drastic effect on outcome
Basketball - bad foul call? big deal.
Baseball - calling a ball instead of a strike? bad call at first base? Not a big deal.
Soccer - call a penalty shot (HUGE effect on game result) because of a shirt tug in the box (Italy), miss a couple handballs that assisted a goal (Brazil) [and then ask the player afterwards if it was a handball?

You guys should be capping the refs instead of the players.