Human beings are animals. As animals, we have biological and physiological functions over which we have very little control. Our emotions are the result of biochemical responses to stimuli, responses that are shared qualitatively by many other primates. The selective advantages to these responses are fairly clear: emotional bonding to our mates occurs as a function of oxytocin and other chemicals, functioning as a "glue" which confers beneficence to reproductive fitness.
As some of us are obviously predisposed towards more emotional displays than others, it doesn't reflect upon any notion of free will (laughable as that is). We really don't have a lot of control over our levels of sentimentality or propensity towards weeping. And it may be the case that the more control we have (genetically speaking), the more proclivity we have for rational thinking, rather than wishful thinking. But no matter how rational we are, we cannot deny the animal part of us that feels.
I think the problem isn't that we some of us lack control over our emotions, and make decisions emotively. I think the problem is that the nature of some decisions is that there is no logical argument that can be constructed from known true premises.
As Donna Druchunas writes:
What I have outgrown is my naive belief that logic trumps personal experience and emotions in every situation.Examples here would include how to handle forgiveness in a relationship, whether or not to change careers...&c. Even if we can throw a few true premises in, like, "Well, she's never cheated before," or, "I'll make more money as a patent attorney than a teacher," there are always lacking threads to join these premises together to reach a conclusion. For example, you just don't know if she will have the capability or opportunity in the future to cheat, or whether or not the job market will be in the future where it is today. Thus you can't rely on these premises to take you to a straightforward conclusion.
Spock is my hero because he uses reason as far as he can, and then admits when there is uncertainty involved in a decision. Humans must live with and make decisions from uncertainty and doubt. That doesn't mean we can't rely on logic and reason, jettisoning them in favor of how we feel, as most analyses can include at least some logic. It's just part of the human condition not to know everything about anything.