It's energy you can harness and channel into something useful. It's a fire you can tame. You can prepare "mental rockets" ahead of time, and when the anger arises, you use it to light one of your "mental rockets."
Hate is like a smoldering coal than you can carry around for a while. But you better use it soon, or it will start its own fire and burn you. Best not to walk around with smoldering coals in your pocket :)
“With laws shall our land be built up, but with lawlessness laid waste.”