He was talking of capitalism to define the complex artifacts of technology. He thinks that without abundance of cheap capital from capitalism, science and technology would had gone a lot much slower. When the state is the main owner of a nation, or an empire, he can limit he fields of inquire to those most cherish by the dominant class. In the example of the Soviet Union, they had in the aim his antagonist power, the USA, and they wanted to prevail and surpass them. Then any new discovery, any new technical advance, not foresighted by the leaders had to be copied or rediscovered. Specially in the field of technical warfare and killing machines.
The main differences between a system with strong control of a nation is that they force the scientists, or the philosophers, to justify their role in society.
While, in general, the capitalist nations function with more diverse groups who have more freedom to act on their own. A modern capitalist state functions as a multiverse of ideologies and in general, such states are weak. Do not impose lines of thought on people.
I said "modern capitalist" state, because capitalism is more or less very ancient. When the interest of earning profits with trade is tenet of society, ideology occupies a secondary or minor role. While the states that play a strong role tend to control with the help of an ideology. An ideology can be either religious, or a political not religious doctrine. The stronger is such a state the more stringent is the society, and some trades, some activities, and some line of thinking can get prohibited.
So, it is a relative situation with a state more or less stringent on what people can do or what cannot do.
Then, freedom can also serve also to some good purposes, besides rebelling and tumbling down a government. That is so difficult and delicate to pass from a political system with little a degree of freedom, to another with more or less abundant freedom.
Then, philosophers of different stripes can be against this or that class of freedom.
It depends on the philosopher in question.
John Galaor
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