Optimism means you assume a good outcome. Pessimism means you generally perceive risk as more likely. Anger is a reaction to a potential threat; you already see

Optimism means you assume a good outcome. Pessimism means you generally perceive risk as more likely. Anger is a reaction to a potential threat; you already see risk and think you can change it. Happiness is a state of contentment. So.... Yeah, if you're happy, you generally perceive low risk and don't see a need to be defensive or change anything. But we don't live in the jungle. We don't have to be constantly on guard, because we are on top of the food chain, and generally speaking we don't need to compete to survive or even thrive. So the premise that being angry will make you live longer is at best misguided. If anything, being angry will more likely help you assume a defensive posture; not many people want to attack someone who looks like they will attack back. But again, this assumes your livelihood depends on fending off attacks, or beating other people. Not all people live those kind of lives. Finally, things like heart attack are probably more related to genetics and diet than how angry you are. But being angry also clouds your judgment, meaning you're less likely to take advice, like your doctor telling you to lay off the doughnuts and red meat.