Emotions are suspect, because they change with our moods. Love, anger, sympathy, fear, are all merely chemical changes that we interpret subjectively. We re happy when things are going well, sad over losses and angry when things go badly for us. Emotions allow us to be swept away by life, reacting to things instead of taking responsibility for ourselves. An emotional outlook allows us to blame others for making us mad, or making us happy, when only we can do those things by the way we interpret facts and circumstances.
Emotion is an unreliable and unstable indicator, because feelings are fleeting and transitory.
The logic of rational thought is intractable and definite. Still, we all have emotions. There is no such thing as a completely logical human. We re all effected by emotions. Logic just allows us to control our emotions and most importantly, our reactions to them.