The reason being that color theory is a lot more nuanced and complex than that. Blue is, too, associated with sadness. Ambiguities or discrepancies in the meaning of a particular color are to be expected. They are, after all, just light waves. They don’t hold the great amount of the psychic energy that we like to ascribe to them. I mean, think about it. What are we to do with colors that resist an immediate identification of their evocative powers? Colors like orange, burgundy, gamboge, wenge, amaranth. (No, I didn’t just make those last three up, even though it feels like I did.) It is estimated that the human eye can see several million different colors. If we were turned by every single color and hue we encountered in our daily lives, we would probably go insane from all the stimuli.