Sorry, I should have been more clear.
The statement “The brain is the seat of intellect, the heart is the seat of emotion” is not meant literally, of course. It’s simply a well-known device to use these organs as a sort of metaphor for the difference between moral and intellectual choices.
I’m just stating that I understand the use of this metaphor, if that’s the right term.
Here’s another one, cleaned up for use in this forum: “The guy’s thinking with his genitals, not his head”. Obviously, this indicates that the gentleman is allowing his baser instincts to overrule his intellect in making sexual choices.
Using parts of the body as a metaphor for mental/emotional/instinctual processes is a well-known device which IMO, are okay for use in debate as long as everyone involved understands and accepts their meaning.
If this use of language is not accepted and understood by all, the debate gets bogged down in semantics and fails to move forward. As appears to be the case at the moment.