How cancer fits into the evolutionary context is obviously important to understand, but the author's conclusion is unfounded. Cancer rates in the ancestral env

How cancer fits into the evolutionary context is obviously important to understand, but the author's conclusion is unfounded. Cancer rates in the ancestral environment is set by a balance between costs and benefits of anti-cancer mechanism. But we are not in the ancestral environment, and there's no a priori reason (Darwinian, thermodynamic, or otherwise) to think that cancer rates couldn't be driven down to negligible rates given our much greater resources.