I’ve never agreed with the conventional wisdom that ‘actors are great liars.’ If more people understood the acting process, the goals of good actors, the conventional wisdom would be ‘actors are terrible liars,’ because only bad actors lie on the job. The good ones hate fakery and avoid manufactured emotion at all costs. Any script is enough of a lie anyway. (What experience does any actor have with flying a spacecraft? Killing someone?) What’s called for, what actors are hired for, is to bring reality to the arbitrary.