[VadeRetro]

At any rate, these words indicate Darwin wanted to distance himself from the author.

Who seems not to have been Marx. At any rate, you apparently want a refusal to make implied endorsements of unread works to sound somehow sinister. That's very unreasonable. It's little more than refusing to give others a blank check on your credibility account.

But why would Marx want to dedicate a book, or volume, to Darwin?

How Marx reasoned things is irrelevant to the diversity of life on Earth.

[Condorman]

But why would Marx want to dedicate a book, or volume, to Darwin?

Why wasn't Jodie Foster charged as an accomplice for the attempted assassination of Ronald Reagan?