I've encountered the following claim: If we, as Popper apparantly did, view Marx and Freud's body of work as non-scientific because core tenets are not falsifiable and we apply the same rubic to Darwins theory of evolution, the latter would also appear to have non-falsifiable (core?)-tenets. According to the claim, Popper himself was well aware of that dilemma.
I don't follow the last part. Here's where I think I follow the argument:
Within Marx' work there's certainly things - the whole theleological attempt to predict history - that are either plain false or so wishy-washy that they're not falsifiable. Marx core axiom, the labor theory of value, is likely untestable. So I kinda follow that for Popper, Marxism is not a science.
Freud posits the unconscious - that we can't observe - as well as a few other concepts that can't be tested, or at least not in isolation.
What I don't understand is the claim that applying that rubic to Darwins work, we should discard it too. Darwin himself said: "If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. But I can find out no such case."
To me, it appears that there is no dilemma. But maybe I'm wrong. Is my very brief summary of likely Popperian attacks on Freud and Marx grossly wrong? Did Popper ever comment on the dilemma stated at the beginning of the question, or does it simply not exist?