If you get into an argument, or someone cuts you off in traffic, or you get called an awful name, venting will not dissipate the negative energy. It will, however, feel great. That’s the thing. Catharsis will make you feel good, but it’s an emotional hamster wheel. The emotion that led you to catharsis will still be there afterward, and if the catharsis made you feel good, you’ll seek that emotion out again in the future.