If two people began to fight in the street they would be breaking the law. Assault and battery, attempted murder, and malicious intent to harm chargers would surely be brought against the two combatants or at least the one who got the better of the other. But if we put several ropes around these individuals and they commenced to fight we would call this boxing. Same can be said of hate. Inside a stadium or a sports context it is okay, but say the word hate outside the ropes and it has a completely different and angry meaning.
Hate produces an action, which produces a reaction and so on.
Hate in a sports context is without release, unless of course your team wins it all. And then it is only temporary until the next season begins and the process boils back to life. I used to feed my hatred for the Yankees by rooting for any team that played them, but this is very exhausting especially when your newly adopted team loses in the process. In a sense, you are using negative energy via a middle man to achieve your goal of beating the Yankees. My wife says that I should practice positive energy, by rooting just for my team.