The problem is you seem to think the bigger incident is automatically worse. Mr. Evil is sitting in a tower. He has two weapons, a rifle and a rocket launcher

The problem is you seem to think the bigger incident is automatically worse. Mr. Evil is sitting in a tower. He has two weapons, a rifle and a rocket launcher. Scenario A: He rolls a d100. If it comes up 1 he picks up the rifle and shoots at the first person he sees. He's competent, his target dies. Scenario B: He rolls two d100s. If both come up 1 he picks up the rocket launcher and fires at the first group of people he sees. The shrapnel from the rocket will kill 10 people. You live in the city he's in. Do you want him to roll one die or two?