Desease as an Advantage

You know what I was just thinking about? Desease, especially when people are old, is an evolutionary advantage. Well, it's actually death that's the advantage, and any way to cause the death will help out. Before humans had the intellegence to fix stuff with their brains they needed to evolve, and you can only evolve as fast as the turnover rate. Species that can turn over very quickly, that is, reproduce and then die, are able to evolve much faster than species that have slower turnover rates. And organisms that reproduce and then live much longer afterwards are of no direct benefit to the species as a whole in this scenario.