I don't think you should always stay calm in a tense situation, because you might not ever confront the problem. Maybe it's better to actually let yourself be tense - and find a solution.
Yoko OnoWe're growing up together, the human race. And we've discovered a lot of things that we didn't know. We're finding our way. Instead of thinking about doomsday all the time, think about how beautiful the world is. We're all together, and together we're getting wiser.
Yoko Ono