The most frustrated and most stymied it is the fact that the United States of America is the one advanced nation on earth in which we do not have sufficient common-sense, gun-safety laws. Even in the face of repeated mass killings.
Every attempt to solve the laws of causation, time, and space would be futile, because the very attempt would have to be made by taking for granted the existence of these three.
In our system, we leave questions of fact to a jury. But to render a verdict, a jury must know the law. For this, we rely upon jury instructions. Instructions are supposed to translate the law into lay terms that the jury can apply to the facts as they determine them.