1. A big part of the political spectrum believes a free market will lead to the best resulting infrastructure
2. Internet infrastructure is one of these things where the "shape" of the incentive structure can make or break how things develope
Therefore if your goal is getting fast broadband for as many people as possible as soon as possible, political or organisational interventions will get you there quicker than just waiting and hoping. And getting their could be key for the future economic development of whole nations.
Gladly we have many regions and a few decades of network infrastructure building, so seeing which approaches worked and which didn't is just a matter of looking carefully and trying not to lie to oneself about this.
That being said: so far the "free market" approach didn't really keep its promises if we are honest.
I will concede that even if the market were free, there'd be plenty of edge cases (a lot of last-mile infrastructure) that'd reduce access, and I think those cases are where the government can excel. But realistically it seems more likely that Starlink is going to be available sooner than any movement from local governments.
I wish it would become less common place on HN to share articles that a) are hidden behind paywall and b) start with a loaded sentence antagonising some abstract unknown political entity (who even is "the left"?). The entire article is about lacking broadband in the US. Why even include some random rambling about US politics when the subject matter is not even political to begin with?