I think the main issue is that no matter what type of system you have (capitalism, communism, socialism, etc) it is the responsibility of each individual citizen to be vigilant against corruption in their leadership and system. Because any system is vulnerable to corruption, and any system will have terrible results once corruption is widespread in the government/leadership.
In theory, almost any system can produce wonderful results, if there is no corruption, and in my observations, almost everyone championing a particular system, from capitalism to communism, speaks of their ideology within the assumed context that there is no corruption. I get the impression that most people find the idea far too daunting, of having most people be vigilant, brave and caring more about their community as a whole than their own personal gain. And I would agree that that is indeed a pretty daunting and perhaps overly idealistic goal.
So anyway I get the impression that a lot of people turn to concepts and champion those system concepts, because it feels more hopeful and comfortable, the idea that, "If we just used this system, then everything would be fine."
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