Not entirely orthogonal, as they both have an effect on the number of donations. The fact that the shortage will be caused by self-driving cars is unrelated to

Not entirely orthogonal, as they both have an effect on the number of donations. The fact that the shortage will be caused by self-driving cars is unrelated to the solutions to a shortage. As you mention, we can't ethically prevent this shortage by increasing car accidents, so we should look for other sources.