I guess we can agree that the Meyer's Briggs system does isolate some personality traits. The interesting question is whether these traits are useful in predicting behaviour or guiding decisions. I have no idea what the answer is there.
I'm INTJ.
I – Introversion preferred to extraversion: INTJs tend to be quiet and reserved. They generally prefer interacting with a few close friends rather than a wide circle of acquaintances, and they expend energy in social situations (whereas extraverts gain energy).[8]
N – Intuition preferred to sensing: INTJs tend to be more abstract than concrete. They focus their attention on the big picture rather than the details and on future possibilities rather than immediate realities.
T – Thinking preferred to feeling: INTJs tend to value objective criteria above personal preference. When making decisions they generally give more weight to logic than to social considerations.
J – Judgment preferred to perception: INTJs tend to plan their activities and make decisions early. They derive a sense of control through predictability, which to perceptive types may seem limiting.
I think most utilitarians are introverted. Furthermore, I'd guess that INTJs are highly overrepresented among utilitarians, and philosophers in general. I have no way to prove this.
I don't know if one can seriously give a philosophical worldview a Myers Briggs type, but if one can, I think utilitarianism is ISTJ or ESTJ. The point is that most people come to believe in utilitarianism by experiencing the goodness of happiness and the badness of suffering (sensing). We think about how to maximise wellbeing, and then judge an optimal course of action accordingly. I don't know if other people find it useful, interesting, or downright silly to classify our worldview in this way...
INTJs are also drawn to libertarianism, from what I've read. Most people don't abide by a formally thought out moral philosophy, they will arbitrarily adopt consequentialist, deontologist, social contract etc. based stances on different issues depending on their emotional response. I think both introverts and intuitives are more likely to formally identify with any thought out ethical framework. Also, happiness/suffering, although undeniably felt, are abstractions, we can't really observe the emotions of others in a concrete/empirical way. Aside from the idea that the happiness/suffering of different minds can be aggregated, I'd assume that feelers would be more likely to identify as hedonistic consequentialists and thinkers as preference consequentialists/utilitarians, someone who believes that some things have objective value (ie. knowledge) or some kind of deontologist.
Most men are ESTJs, most women are ESFJs (women are even more likely than men are to be extroverts, sensors and judgers) and I think most people lean more towards deontology than consequentialism, I could be wrong.
Jasper,
According to the MBTI, saying that someone is an 'introvert' or a 'thinker' only describes their dominant function, no one is 100% introverted or 100% intuitive. If I'm not mistaken, in MBTI terms, big 5 openness is intuition and conscientiousness is judging. I don't know about neuroticism and agreeableness. I'd be interested in your study.