The argument is not that, for example, the United States, is perfect. It's that whatever Marxists replace it with will be worse.

Alinsky clearly understood the problem with that: charity is in itself a status race and a status pump; it can be wielded with malice and used to keep people down.

A lot of people "understand" this problem in the sense that they know it exists in the existing system. Unfortunately, they frequently have no better understanding of the causes and potential solutions than some version of "the current system has these problems because it is evil/corrupt, once we replace it with our new good/pure system these problems will magically go away".

Just look at Africa and how we're trying to drown it in money instead of coming over there en masse and applying real help, manually. (Which is also problematic status-wise, but at least it might actually improve a society.)

That's what we were doing until leftists forced us to stop on the grounds we were "oppressing" them.

Note: If you think colonialism was indeed bad, what makes you thing doing something similar again will turn out any different?