Every possible combination of theories of life (genetic or memetic) has to be tried if we are to get to perfection. Thus, even if a set of genes or memes ends up being like the dinosaurs, and going extinct, testing out this particular set is still a valuable part of the process of making sure no stone is unturned in our search for the instructions for a better life.
Because life can’t be sure of what is best until it tries out everything, including the worst. Of course, the worst will never last long in this ultimate laboratory that is the universe, so we can be comforted that anything we encounter that is especially anti-life will be gone soon enough, as the process of evolution finishes testing it out and rejecting it as being a seriously failed theory. :-)
One theory of a better life that has been proven by the test of time, and memetic evolution, is that patience is a virtue!