The answer for this particular scenario would involve two bullet points:
- Emphasize that both options have risks
- Avoid direct quantitative comparisons.
The spokesperson needs to say things like "Look there are no guarantees in life. Even if we took option A, there is a possibility of a Very Bad Outcome, perhaps from set of circumstances X. [Elide the fact that these circumstances are unlikely.] If we want the Payoff, we are going to take risks. All we are saying is that we should give option B a chance."
If we got really fancy, we could do role play in class, although right now I don't do any public speaking type stuff in any of my classes. It would be nice to do this in combination with studying the techniques used by people in history advocating for what we now all agree are very bad ideas, such as Bill Buckley's oh so rational arguments for segregation, or the talking points for people paid to say that cigarettes don't cause cancer.
I need more scenarios, though.