At least one judge in Florida gets it.

Judge: Self-defense doesn’t apply in drug shooting – Florida Wires –

If you re buying dope (illegal,) you express dissatisfaction with your dealer (also doing something illegal) about the transaction and both respond with guns blazing (dare I say also illegal), as the law stands in the book you are a moron for claiming self defense.

But apparently Prosecuting Attorneys have trouble with the concept.