Just as there is no such thing as pure chaos, merely systems so complex that they are impossible to define, so too is there no such thing as pure emotion. Emotion comes from a process of logic so complex it is impossible to define.

But for both we can make inroads to better understanding. With chaos, mathematics and quantuum physics can help model some of the less easily understood parts of the system. With emotion, psychology (especially understanding the subconscious) can help sort out why we feel the way we do.

Those who champion logic over emotion are probably ignorant of the true nature of emotion. That, or they are lazily seeking simple systems that they can cope with.