If you say something is bad because people suffer, then you're saying suffering is bad (it is, but bear with me).
So you're suggesting that suffering is bad, which should therefore mean it's immoral.
Therefore, you're suggesting that capitalism is immoral, because it causes suffering.
Your argument is no less of a moral appeal than anybody else's when you get down to it.
Okay, I get what you're trying to say, but I don't think this is the place for this discussion (maybe the thread on morality?). I'll only point out that I definitely did not say that exploitation is bad, and most of what I was trying to get across was more along the lines of self-interest rather than morals. But sure, the line between the two is probably thin and I can admit that it isn't very clear to me.
An interesting corollary question would be whether an argument that definitely does not constitute a moral appeal, within political discourse, is even possible, or is it that every argument can be stripped down ("getting down to it") to a kind of a moral appeal. I don't know honestly how to approach this and what implications to draw out.
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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