For example: what if there's a man, accused of murder, of whose guilt we're 50% certain. If guilty and not executed, he'll probably (90%) kill two other random people. Should we execute him?

If we're weighing equally the lives of everyone, both guilty and innocent, and ignore other sideeffects, this reduces to:
- if we execute him, 100% of one death
- if we don't execute him, 45% chance of two deaths.