If "Darwinism" was biologically inherited that might be the case. It is not. It is a scientific field.
Nice try though.
Susceptability to different types of idea or philosophy could easily be biologically based. Indeed, if survival is enhanced by having certain points of view, then evolution guarantees that organisms who tend towards those points of view will be selected for. A mechanism to steer the organism toward those points of view will develop if at all possible. For example, humans are born with a fear of snakes and loud noises because those fears aided survival. There is no reason to suppose that some people are born with a tendency to be swayed by one kind of idea over another.
It's propaganda.