To me there is an inherent contradiction in the concept of a 'free market'. They work very poorly unless there is protection of a number of market attributes.

One fundamental attribute is the protection of property rights - otherwise that market would be chaos and whoever could muster the most force could automatically take everyone else's property and destroy the 'free market.'

But the very act of 'protecting property rights' isn't as simple as just the enforcement of who owns what physical thing. There are fuzzy lines all over the place e.g. if I buy a beautiful plot of land to live on, and a neighbour sells their land for use as a garbage dump - how is that resolved?

So when someone criticizes that its not the 'free market' that failing, I think that's partially right and partially wrong. What often fails is our many rules (i.e. regulation) to try and build this abstraction of a 'free market', but when someone says the free market isn't failing because it can't because of gov't regulation - well .. this is wrong too, because without some form of framework of regulation (formal or informal) I don't believe you'd find any stable large scale free markets.

The other issue here is when people say 'free markets', I think they unconsciously mean efficient free markets. And then there are a number of other attributes that really need to be there in the abstraction for it to work (e.g. reasonable information equity between sellers/buyers).