I think you're wrong, the theory of evolution has been suffering under the oversimplification that is 'survival of the fittest', that also led to e.g. Social Darwinism, which is dangerous and completely bogus.

Evolution Darwin already knew (and even more so we nowadays know) is a complex mechanism, that includes favoritism of certain traits of species over others, which steers a species' fitness for the environment, and several factors play various roles, e.g. epi-genetics.