No, it's not. There are affirmative defenses: things that can excuse you from criminal liability if you prove a certain set of facts. For instance, self defen

No, it's not. There are affirmative defenses: things that can excuse you from criminal liability if you prove a certain set of facts. For instance, self defense is generally an affirmative defense: something that the defense must prove to avoid conviction, instead of something the prosecution must disprove.