You literally said "Art is also a basic human need, though one more abstract, and less essential (though even cavemen had it)" and are interpreting that to mean that Art is a commercial industry that needs to be protected artificially. That's a pro-capitalist viewpoint, and your entire argument here has been "this is the way things are and there are no socialist countries so we shouldn't bother changing things, and just be good consumers." Which is the sentiment of a liberal who does not wish to fight capitalism in any form.

In short it is pro-capitalist to uphold the status-quo, just because of the way things are. That line of thinking doesn't create change or positive impact. It serves to keep things the way they are.