> There is no such thing a truly free market.
Nothing human is perfect. However, history shows us that the more free market an economy is, the more prosperous it is. It doesn't have to be "truly free" to be effective.
In contrast, whenever socialism is tried and it fails, socialists describe it as "not true socialism". Since there is also no such thing as true socialism, the more "true" a socialism is, the more it fails.
> However, history shows us that the more free market an economy is, the more prosperous it is
As my example with the Nordic countries show (and there are many more), this is certainly not true. I don't know why you mean by "true socialism", there no such thing. Socialism is a broad category of economic and political philosophies.
However, how anybody can look at neoliberalism and say that it has been successful is beyond me.