Evolution came up with a range of tools that each work best in different situations. If you're never kind, collaboration and group effort become hard. People d

Evolution came up with a range of tools that each work best in different situations. If you're never kind, collaboration and group effort become hard. People don't want to join you. You will miss opportunities to strengthen your group. In the long run, your line will lose out. If you're never "grumpy" or bad tempered or forceful, you'll just get obliterated eventually by some great force randomly sweeping the neighborhood. Do not think it never happens. Sometimes the best response is force. And then there's everything else in between. It's a range, and all components are there for a reason - they performed well in the evolutionary past, so they got included in the toolkit. Use it, and use it wisely. The optimum is not a narrow point - it's a wide range of diverse responses. Width is crucial.