It’s not a matter of who they’re for or against; it’s a matter of the fact that the ref can decide who wins, rather than the players on the field. And he can apparently do so without any explanation or accountability.
You're entitled to your opinion, but you're not entitled to your own facts. The fact is that in a sport with only 1 or 2 scores a game, a bad call on a goal affects the outcome to a degree that is not present in many other sports. That level of influence makes soccer more like figure skating or gymnastics. Heck, the ref doesn't even have to tell anyone what his call was. In football when there's a penalty, the ref stands alone and tells the entire crowd what the call was and even the number of the player who did it.
Part of the American character. much of what made us successful, was an unwillingness to accept "good enough" or "that's just the way things are." Having traveled fairly extensively throughout the rest of the world, I've come to realize how powerful and unique that attitude is.
I guess accepting things as they are means one is rarely disappointed.