An old and well-known philosophical conundrum may be stated in this way: if we assume a universal law of cause and effect, then free-will disappears. Any action of mine is caused by events which must in turn be caused by prior events and so on. So eventually all the causes of my actions lie outside my body, otherwise I’d have to create an uncaused event. I see no harm in accepting this argument. Many of the things I do still feel like the exercise of free-will because I understand them and that’s all that matters to me. Understanding is a kind of involvement.
Anyhow, the next step is to imagine political opinions as lying on a simple scale from extreme left to extreme right. It doesn’t matter how over-simplified this is, because the point being made isn’t political. Most folk with hold political opinions somewhere near the middle. A middle of the road consensus will be the norm.
If matters didn’t sort themselves out in this way, there would be no such thing as a society, because all we are pointing out here is our natural tendency to cluster, in this case around political norms. It’s social cohesion doing its job. It is our tendency to emulate because emulation saves time and cuts down mistakes. But we can’t expect to control these things. As there is no free-will, we are always controlled, we never control. We may understand, but not control.
So those in government never control anything, which is probably why they often seem so absurdly incompetent. They no more exert control than those outside government. We commonly assume that prime ministers and presidents exert control over those who are not prime ministers or presidents, but this is simply a convention. A political leader is merely a clearing house for external pressures to resolve themselves. The largely unidirectional convention of leadership is another example of social cohesion doing its stuff. The myths of leadership are the masquerade that keeps it all going.
Of course, if it becomes too obvious that political leaders are tossed around by events beyond their control, then the leadership masquerade fails. We don't have a spare either - haven't actually invented one yet. Might be a good idea to get on with it perhaps?