Why "should" Statisticians and Businessmen Maximize "moral Expectation"?

The word ‘should’ in the title of this paper has the same meaning as in the following sentences: “In building a house, why should one act on the assumption that the floor area of a room is the product and not the sum of its length and width?”; “If all A are B and all B are C, why should one avoid acting as if all C were A?” People may often act contrary to these precepts or norms but then we say that they do not act reasonably. To discuss a set of norms of reasonable behavior (or possibly two or more such sets, each set being consistent internally but possibly inconsistent with other sets) is a problem in logic, not in psychology. It is a normative, not a descriptive, problem.