If the calls are so subjective that one can't tell the difference between a ref accidentally being way off and on purpose being way off, then maybe your sport/rules are the problem when being way off is either excusable or indeterminable. (in the NBA and some other sports, you can basically call a foul every play)
This is why I mostly stopped watching the NBA and basketball in general. The foul-calling situation is ridiculous. Many offensive fouls get called as defensive fouls and even good calls slow down the game significantly, more than it's already slowed by the million timeouts in the game. A simple solution would be to lower the amount of fouls a player is allowed to commit before they are sent off like the card system in soccer. Or put players in a penalty box like in hockey for a few mins after every foul and make the team play one down. Or just simply call offensive fouls when the offensive player obviously just runs into the defensive player instead of the other way around. There are many possibilities, but I don't see the NBA exploring any of them and they are no stranger to rule changes. Maybe the NBA wants the games fixed, who knows? Regardless, they have the power to fix this and do not. Hard to argue they are acting in good conscience.