A survey of social/political/economic history (even just post-1800) shows that capitalism, as a system, strongly resists 'evolution', and over time erodes those gains which have been made against it.
When people talk about their dream for an 'evolved capitalism' it often comes down to New Deal America plus free healthcare. Yet even setting aside how the post-WW2 economy was a singular moment that we cannot hope to recapitulate, you have to ask: if we _had_ this, and everyone thought it was great, why did we give it up? Or rather, why was it taken away from us?
This is the second fork of 'why not capitalism'? The first -- that capitalism, left to its own devices, produces increasingly terrible ('misaligned') results, is not enough. The second -- that capitalism, as a system of power distribution, strongly incentivizes people to work against any attempts at regulating it, and indeed to roll back those regulations -- is what cinches the issue.