Penalties in hockeey

Hockeey is my favorite sport....EVER. I dont play, just watch. But the one thing about hockeey I HATE is when the refs dont call penalties that should be called. It pisses me off. Whats worse is that the refs call penalties on the team I'm cheering for and never the other team. There is always two teams on the ice and 100% of the time both teams are to blame. Never just one team. So if the refs are gonna call just one team for penalties then its unfair.