What is meant by "pure" logic? Is it non-applied, or maybe applied only to non-defined variables?
Anyhow, the rational is to act according to what is believed to produce a preferable result. A preferable result is a result that is preferred. The preferred is what one prefers. What one prefers is determined by quasi-incalculable myriad factors.
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I can make a statement true by placing it first in this signature.
"Everyone loves the dolphin. A bitter shark - emerging from it's cold depths - doesn't stand a chance." This is hyperbol.
"Run, Jump, Fall, Limp off, Try Harder."