He is the PREVARICATOR-IN-CHIEF.
He LIES!!! Just speakin’ truth to power.
Caligula doesn’t know the truth. It isn’t in him.
Unfortunately, this is like those situations where a judge instructs the jury (in this case, the audience) to disregard a falsehood made by a witness (in this case, the PREVARICATOR-IN-CHIEF).
The damage has been done.