Well, if you attribute soviet and chinese atrocities to communism you should also attribute colonial empires atrocities to capitalism. And then it's basically arguing about the estimates.
> And if capitalist countries do this to each other, it's not capitalism per se to blame, it's other aspects of politics (imperialism, colonialism, Neo-colonialism etc.) that can be separated from capitalism
That's just the branding decision I was speaking of. You chose to brand the sane modern version of capitalism - still capitalism, but sane modern version of communism - socialism. That way you get the conclusion you want cause of your political beliefs. I don't really care for branding, but lets be honest - it's not some universal truth, it's just a consequence of your decision of assigning labels to political systems in a particular way.
BTW famines were pretty common before Haber-Bosch process. Usually caused by natural causes + mismanagement. Sometimes also by bad intentions. None of these are political-system-specific. See the famine in Ireland for capitalist example.
> This should over time reduce the amount we spend on social programs, which is in line with what I believe as a liberal that wants less taxes.
As I see it in future most of the productivity will be concentrated in top 1% of people assisted by global empires of AI and automation and protected by IP laws [1]. And the rest of us will pay almost no taxes because we will provide almost no value so there's nothing to tax. If the rich fear the revolution and state control enough to pay for everybody else - we get post-scarcity. If not - we get a dystopia. Possibly both in different places or for different groups of people.
As for the mechanism - I don't really care. Make it UBI or make it 95% employement with most people doing useless jobs for 8 hours a day. End result is the same.
[1] thought experiment - in a world with self-improving general AI and IP laws but with no political mechanism to force someone to give up his IP to others - how do you prevent a world-wide monopoly