Presidents do not play an important role in running the nation

Yup, looks like another unsupported conspiracy theory, with vaguely antisemitic overtones.

You’ve never talked to a veteran? Known a family who had someone serving overseas?

In the US the president appoints cabinet ministers.

Not all that many corporations are owned by families any more. Plus, if you were correct, policy would not change when presidents change. Which is not what happens.

What do you think a president does all day? Other people do the research and prepare summaries, but the president decides.

One might argue that Rummy and Cheney made the go to war in Iraq decision as much as Bush, but that is an exception. But why would corporations want to waste all that money going into Iraq?

No, you are just very ignorant about how American government works.

Do you consider the military-industrial complex a conspiracy theory?

Haliburton’s influence isn’t a theory - but they are just a tiny part of the economy.

Depends how it is applied. Does the military industrial complex have influence on politicians? Of course. Do they make the real decisions in our government? Of course not.

I was waiting for him to break down from his reluctance to be openly antisemitic and post “The Rothschilds”.

Yeah, the President appoints a lot of those officials, and has power over them. So he does do it.

And “ministers,” by whom I think you mean “prime ministers” are usually the head of a parliamentary body, and thus set the agenda for lawmaking. So they definitely have power.

Now, some figures are just heads of state that have no actual power, like the Queen of England. But those are the only ones who do not play a role in running a nation.

That’s what you have a professional civil service for. The elected politicians define the primary objectives of the government, but delegate to the professionals the research, the evaluation of different ways of achieving the objective, drafting the legislation and so on; but the ministers will handle the public presentation and advocacy. At the same time, of course, political parties and specialist think tanks will be doing a lot of the thinking as well. Nobody comes to this stuff with no preparation at all (if they’re wise), let alone expecting to be on top of every last detail. The trick is, to know how to delegate and how to ensure you get enough thinking time: some politicians are better at this than others.

There are plenty of books on how different systems of government work that might answer the OP’s point. But the most obvious point is that systems that diffuse power and allow for different opinions to be expressed and considered, in an organised and deliberative way, in the long run produce more durable and effective solutions than those that expect some superhero leader to govern everything off the top of their head.