> The idea that morality is alien or contrary to Marxism is
> preposterous.
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Not when it is situated historically, anchored in class, and understood as
other than static and universal.
"It is very easy to inveigh against slavery and similar things in general terms, and to give vent to high moral indignation at such infamies. Unfortunately all that this conveys is only what everyone knows, namely, that these institutions of antiquity are no longer in accord with our present conditions and our sentiments, which these conditions determine. But it does not tell us one word as to how these institutions arose, why they existed, and what role they played in history."
http://www.marxists.org/archive/marx/works/1877/anti-duhring/ch16.htm