The problem with centralized totalitarian/socialist/dictatorial governments is that they can be hijacked by an idea and over-execute on it with no feedback from the people, until the resources really needed are blown out. In capitalism, companies specialize on human needs and if a need goes away, investments can go down rapidly, unless the feedback loop is guarded by some government regulation. But when government is doing the investing, the whims or corruption of politicians has no feedback loop.