but capitalist system does has centralised authority despite the private ownership of wealth it allows.
Capitalism is not a political system it's an economic model!
Capitalism can exist without a central authority; it has existed since prehistoric times: the guy who had a rock could use this rock and trade his rock for a stick, it's socialism that needs a centralized authority to force the guy with a rock to give everyone in the tribe a rock!
You are right that ideology itself is not, but the people who use the ideology could make it political system. For example, as we are well aware of American political parties, let me give you an example from American parties. Republicans believe in free market, and they are fine with drug companies to charge up to 300 dollars for a simple 3 dollar insulin, whereas democrats think that government should have a chance to intervene and cap that at 30 dollars.
Not a clue on what is the latest situation, it constantly changes, but that is what they believe. In that example, you see that republicans are saying, what democrats are trying to do is socialism, and what republicans aim at is capitalism. Suddenly it becomes a political thing, instead of an economical thing.
Government price regulation is an extremely negative approach. Capitalism is based on the principles of an open, competitive market.
And even if we assume that someone wants to sell you insulin for $300, the capitalist market would react immediately and offer you a lower price, since competition drives this market. Some companies might even build production facilities in your country and produce much cheaper insulin by reducing production costs.
Of course, your country must guarantee the security of private business and provide favorable conditions for its development. But if there isn’t enough insulin for your country’s citizens, and the market price isn’t acceptable to everyone, then building such a factory would be a logical solution. It would solve the insulin problem, create new jobs, and generate tax revenue for the budget...
And no, Democrats aren’t striving for socialism-it’s not the best concept for a free world. They do want to borrow certain models, but not the entire system as a whole. At the same time, Republicans don’t want "unbridled capitalism" or government regulation-that’s a fact.