The American justice system was created with the vision that jurors could use common sense and NOT convict a guy like that. The idea was to have a "fully informed jury" so that justice would prevail... i.e., the intent of the law rather than the letter. Unfortunately, that concept is often forgotten in modern courtrooms.
It's important for jurors to remember - they can vote ANY way they want to. They are not punished by the court for not voting a certain way.