Where a population is exposed, multiplying individual risk by the number exposed usually does not capture the real impact, because an event harming many people together differs from separate individual harms. Societal risk is generally expressed and evaluated by the relationship between the frequency of a consequence and the number of people affected, as shown in frequency-number diagrams.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.