1. Since Trump always lies, it's reasonable to reject even a superficially reasonable statement when you learn that Trump said it. And conversely, you need strong reasons to reject a statement from someone you know to be truthful.
2. The usual bogus symmetry. Republicans believe loads of false things, non-Republicans far less. So, any explanation that doesn't predict this must be wrong.
3. Weight of evidence. It's not rational to abandon a belief based on extensive evidence because of a single piece of contrary evidence, especially one presented to you by a psychological experimenter (a group notorious for trickery and deception).
Some qualifications on this
1. Since Trump always lies, it's reasonable to reject even a superficially reasonable statement when you learn that Trump said it. And conversely, you need strong reasons to reject a statement from someone you know to be truthful.
2. The usual bogus symmetry. Republicans believe loads of false things, non-Republicans far less. So, any explanation that doesn't predict this must be wrong.
3. Weight of evidence. It's not rational to abandon a belief based on extensive evidence because of a single piece of contrary evidence, especially one presented to you by a psychological experimenter (a group notorious for trickery and deception).