We (Marxists) oppose capitalism, on basis, because we understand it's systemic contradictions, and it's inevitable destruction.
All teleology should be purged from Marxism. There is nothing about the destruction of capitalism that is "inevitable" (or do you think, in a magnificently scientific way, that history is on a predetermined course?)
If capitalism could support Free Healthcare, Social welfare, Jobs and housing for all, etc., if it could "work", we wouldn't oppose it.
Okay, but then, let me ask you this: why do you find these worthy of bringing about the opposition to capitalism? What's so terrible in the absence of free healthcare, social welfare, in unemployment? On what basis do you conclude that these social problems should be taken as a justification of an oppositon to capitalism?
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“The possibility of securing for every member of society, by means of socialized production, an existence not only fully sufficient materially, and becoming day by day more full, but an existence guaranteeing to all the free development and exercise of their physical and mental faculties – this possibility is now for the first time here, but it is here.” Friedrich Engels
"The proletariat is its struggle; and its struggles have to this day not led it beyond class society, but deeper into it." Friends of the Classless Society
"Your life is survived by your deeds" - Steve von Till