Post scarcity, to me, will not happen while we are still classified as human. The vast differences in desire and ambition within the human species will always be huge. Some will want to vacation on mars, some will be happy living in a shack. Those differences will lead to vastly different inputs and outputs.

Yes, I agree we have enough resources right now on the planet to food and clothe everyone, but it's a lot more complicated than that. If we tried to unilaterally make everyone the same right now, over all human well-being would go down (IMO), because the inventions and world-changing concepts aren't coming from the bottom of Maslow's Hierarchy, but from the top. We'll never advance as a species if we're trying to pull the best of us down, but only if we work to pull the lowest up. To me, that has to be done within a moral society which means via voluntary interactions. The NAP and all that.

environmental destruction

I see government as one of the worst polluters out there. They legitimize it, package it, and sell the privilege. I may be wrong about that, but the corruption level right now is insane.

weapons industry

I'm lump this in with private prisons. They only have one customer: the government. That's not a market, that's a monopoly. Remove the government, and this market will dry up because most people aren't willing to waste a trillion dollars on a plane that doesn't even work.

child labour

From my perspective, I think many people misunderstand some aspects of labor markets historically. It's easy for us to judge others and say "Those sweat shops are bad and you should feel bad! End them now!" without realizing, potentially, within that country, the only alternative might be starvation and death in the fields. I'm not justifying child labor, I'm just saying there's a lot going on and historically different areas have gone through different transitions (agricultural, industrial, post industrial, etc). We should help these processes move along as quickly as possible, but I don't think it's humane to stop them if people suffer long term. (Again, listen to Yaron Brooks on this stuff).

toxic work environments

Quit. In the global Internet economy, there are a lot more options (including blogging on Steemit!) and people aren't locked into dead-end jobs as they have been in the past.

You say "global capitalism" but I say "government created false monopolies." That's where things get messed up, cronyized, etc.

At least, from my perspective.