Not only do alignment mechanics kill any kind of nuanced approach to ethics and morality, but it isn't even internally consistent with the setting. Faerun has a pantheon, rather than a single deity. So it should stand to reason that for a paladin to smite with the power of their patron deity, they should be smiting according to the misalignment of the one they are smiting, rather than some universal complex plane of law/chaos/morality.
A character who chose to spare a repentant murderer from execution should get good points according to the doctrine of Eldath, but by thus subverting justice they should get evil points according to the doctrine of Tyr. If a paladin draws power from their patron, a paladin of Tyr should be able to smite those pacifists who seek to undermine justice at every turn, whereas a paladin of Eldath should be able to smite only as an immediate act of self-defense or defense of others. A single universal alignment mechanic makes no sense for a diverse pantheon of judges.
This is how it works in Faerun though. Each god of the pantheon is associated with a typical alignment, reinforced by the literal existence of the hells with LE devils and CE demons. Clerics/Paladins are supposed to do things that match with their god's alignment/goals/values. Paladins of Tyr should follow the law and bring justice, where followers of Tiamat should be greedy and try to gain power at the expense of others. Everything in your example quoted is exactly how it works. I think you're conflating "Good" with "liked by the god," which is incorrect. An evil god likes evil actions and thinks that's the correct way to live, but they're still evil actions.
Intent matters for alignment, so your socialists'/capitalists' actions would depend on the environment they're in and their goal. Capitalist in order to amass personal wealth? LE. Capitalist because you want to fix the injustices of feudalism? LG, maybe NG or CG depending on how you're achieving their goal. In Faerun, Good is effectively synonymous with selfless/kind and Evil is ~greedy/selfish. But there's infinite different ways that you can play a Good character (e.g., Greater Good vs Individual Good), each of which is valid but might make more or less sense for different Gods.
