I mean, I guess that's a position you could take, but it seems like a pretty extreme one.

People talking about "prison abolition" aren't talking about reform when they do.

Some people talking about prison abolition (but far from all, or even the majority) might also be willing to accept reform as an intermediate step or compromise, and might engage in discussion about the shape of reform that might be acceptable in that role, but that's secondary too, and not the focus of, their advocacy for abolition.

You may not respect it enough to take it seriously, but it is a position that some socialists hold.

Of course, one does have to be careful with one's definitions when talking about "capitalism", because I've seen people mean everything from "the current, specific, late-stage capitalist system and nothing else" to "the basic concept of exchanging currency for goods and services" and everything in between. Personally, I'm in favor of abolishing the former and some of the stuff in the middle, but I'm skeptical that even in a fully post-scarcity society we would abandon the need for the latter.

As for US hegemony...I think that the current situation demonstrates very well why it's a serious problem. We're a single point of failure, and the polarization here has been rising for decades, leaving something like this all but inevitable. Indeed, even if someone like Trump had not come along and normalized hatred and fascism, we would still have likely been in a situation where every 4-8 years the US's policies on a wide range of things flipped violently back and forth.

No; while I fear that the transition will be very rocky, the world will be better off if a broader coalition of nations can collectively take up the role of attempting to enforce the notion of universal human rights across the globe. While they're at it, maybe they'll finally be able to get the US to agree to things like the UN Convention on Rights of the Child, and the authority of the International Criminal Court.