Full Idea
In decision theory, there is a view according to which the rational basis for all decisions is evidential. This kind of decision theory is typically contrasted with causal decision theory.
Gist of Idea
Rational decisions are either taken to be based on evidence, or to be explained causally
Source
E Conee / R Feldman (Introduction to 'Evidentialism' [2004], p.3)
Book Reference
Conee,E/Feldman,R: 'Evidentialism' [OUP 2004], p.3
A Reaction
Your Kantian presumably likes rational reflection on evidence, and your modern reductive scientist prefers causality (which doesn't really sound very rational).