If such a break between old colleagues happened now, the results would likely be very different.
Alfred Russel Wallace reasoned his way to affirmation of an “Overruling Intelligence” — intelligent design by another name — at work in the long history of life.
Whether the subject is evolution or climate change, the purpose of accusing someone of “science-denial” is to keep that person in line.
Wallace broke with Darwin and became, arguably, the founding father of modern intelligent design theory.
Following Darwin, with an assist from Stephen Jay Gould and Richard Lewontin, Ken Miller proposes that human reason, consciousness, etc. are exaptations, or “spandrels.”