There's a misconception that survival of the fittest means survival of the most aggressive. The adjective 'Darwinian' used to refer to ruthless competition; you used to read that in business journals. But that's not what Darwinian means to a biologist; it's whatever leads to reproductive success.
Looking at voter behavior over the years I'm always interested to see and impressed to see how voters eventually find the key issues that matter to them to cast their vote.