Concentrating power is not exclusive to capitalism, and is more natural than not. In order to improve outcomes relative to capitalism, you must make a system which is geopolitically competitive with capitalist states while simultaneously actively avoiding concentrations of power. Saying capitalism is the problem is problematic because it does not account for this. If we limit our scope to saying capitalism is the problem, then we allow ourselves to advocate for systems which not only perpetuate the problem of power concentration, but worsen it.

That's not unique to capitalism. That's just what living in a society made up of humans is like. Incompetence and malice (whichever applies) will exist for as long as there are people.

You can't. Unfortunately democracies are run by the people. But think about the alternatives. At least democracy has a choice to not vote for him or vote him out in other systems that option may not be available.

America isnt fucked because of capitalism. I believe its fucked because of the American people. I believe their government does reflect their views in the way it was designed. I'd say the only way America could stop a person like Regan getting in is to convince people that those ideas are bad and to not vote for anyone like that. Easier said than done but not impossible.

Other government systems that allow smaller parties are in my opinion far better because they can reflect more views at a single time and force major parities to address popular issues. Other capitalist countries are not like America and while life isnt perfect and there is still inequality they still enjoy a decent quality of life and a fair society to operate in.