Political Memes

This brings up one of the questions I have in regards to capitalism criticism. I understand that child labor is bad I would prefer labor be done safely and with respect. In a capitalist society undereducated and vulnerable people get the short end and often do these jobs. In a communist system dangerous and dirty work still needs to be done. How would labor be allotted that would cause a more egalitarian outcome. Personal example of my family were migrant farm workers. Uncle fucking hated doing field work he saved capital, went to community college, got a good paying job, is now paying my cousins way through cal poly. If the system is set up so that work is done by those who can then realistically he could still be a field hand and my cousin would probably follow him. How does a non capitalist system deter formation and unintentional enforcement of caste systems.