Earlier quoted context omitted.
Humans presumably are seen as sentient yet [the majority of us?] are being exploited in one way or another: Capitalism has no inbuilt concept of respect. If you meant not exploited for food, that is obviously different. I'm not aware of any humans that do that anymore. Now tell me how you judge sentience?
Why can't we respect human dignity like those communists who murdered and starved tens of millions of people, ruined economies, and consigned countless people to oppression and deprivation?
Except if one can't think of any other alternative or starting point from which to criticize capitalism but communism (and even more so, how some specific regimes practiced it).