The rule, as he explains, is arbitrary. True, the designing agent inferred by ID theory is not directly observable, but neither are the elementary particles.
Clearly a naturalistic bias is at work here and imposes a limit on the spectrum of alternative explanations that is even considered to be permissible.
Whether your dog can philosophize is not a puzzle you need to look to the Oxford English Dictionary to resolve.
He canoodled with white supremacists, and now advises conservatives not to engage with Darwin skeptics.
This is the refrain of the book: “It is all or death!” “All or nothing!” Half-solutions are no solutions at all.