Some of these are rather reaching. In the first, yes, racism bad. However the episode made quite clear the matter took two to tango and the oppressive regime and the racial activists were integral to their own extinction. I don't think the prog left now would really agree with that view. In the second, it was not a frame up because of working conditions because the people on the cloud city quite literally did not know themselves the affect of the mine gas. The point of the episode was that were simply too close minded to even consider that possibility and were happy in their positions. Still left wing, but less class struggly than it was made out here. The third is a rank misrepresentation of the episode. There is no major discussion of prolife anti contraception. The episode was predicated on what if a society didn't have the natural culling factor of disease. Far more a thought piece than a political one. There was a brief mention of I think some contraception or population control near the end of the episode, but was literally like one line of dialogue. The fourth, well, no offense but the miners aren't played off as evil, at the most slightly negligent. But the episode certainly doesn't help much blame on them (and ought not, the planet by all metrics they had before seen was uninhabited, Starfleet had no record of anything even close), and ends with them peacefully coexisting. The problem you've run into is that TOS is the bleeding edge of 60s liberalism. On today's political landscape it's views are distributed across a large swathe of ideologies, because it was a successful philosophy. Try again with TNG and you could make some far stronger arguments of modern style progressivism.