[s1artibartfast]

The point is how our institutions should behave in the presence of unknowns.

1) You can state your recommendations and present the supporting data, assumptions, and unknowns.

2) You can state your recommendations as unquestionable facts, ignore contradictory data, and admit no uncertainty.

Reasonable people can understand that recommendations will shift over time. That said, to be a credible and respected source of information, you can't lie or overstate your case for maximum impact.