Do you have a sister or a wife? ^o)
As much as women like to think that their constant fluctuations of hormones do NOT change their views and perceptions, I beg to differ. I work with women regularly and I tell you first hand, not only from observing myself, but observing and journal their behaviors that every time hormones shift, so does their commitment to things, so does the way they discipline their kids, so does the way they run their marriages and even the choices of foods they make. Men do not have these constant shifts unless they are bipolar or have a psychological issues.
You'd have to understand women's physicality to really grasp this concept. The level of effect these constant fluctuations has on each woman will vary on her health, but I would NOT want my country, city or town to depend on a woman's hormonal fluctuations.
THEN, there's the vulnerability issue. Women generally have a MASSIVE heart and compassion towards others. That is what makes us capable of raising children and dealing with men's crap (yes, I said it). This capability can make us easily persuaded by something that sounds appealing emotionally, like giving the absolute wrong man a chance (just as an example lol). These characteristics are not something you want when you must be firm, for example, when you are leading people.
Before any sisters get offended, please journal your behavior for at least 3 months straight and you'll see the patterns I speak of, guaranteed. It is predictable to me, so much so that when I have a client with certain issues, I will ask her what part of her cycle she is in. During ovulation times she will be much happier, confident and willing to make changes, come the week before menstruation and I hear alot of complaining, weeping, unwillingness to cooperate, changes of heart and weakness with previous commitments.
Allah made men and women for different roles in life. It's really that easy

I personally would absolutely hate to lead a country or a mass of people. In a way I actually do that among women as I participate in groups, teach and advise, but I tell you, my feelings and tolerance levels change drastically, so I work around my own fluctuations, this way I stay consistent and don't hurt anyone's feelings LOL.