It comes with being a sports fan. Refs are human and thus, they err. There are no guarantees the refs are going to make the correct call during a game. But we watch anyway. Why?
It's a game. It's a freaking game. It's entertainment. It has zero impact on what's really important in life. I used to get upset about sporting events 30 years ago like you do now. Then, I put them in their proper perspective. It's just a game and is not worth the emotional value you're assigning it.