"Antibodies" is a vague metaphor, by which I meant any aspect of your decision process that blocks or sidetracks a dangerous chain of reasoning. I didn't think about whether these blocks were active responses, or passive omission of a justified inference (eg., disconnected beliefs).

It operates as a metaphor by suggesting co-evolutionary dynamics as a way of looking at the problem. It's not a valid metaphor for trying to figure out the exact mechanism.