Good thing Nazism isn't sound, nor does it sound good, even without the label.
it was brought up to explain why "it's just saying it has negative connotations" doesn't make something neutral
Marxism is popular and easily understood, yet red scare propaganda and anticommunism has given it a negative connotation
you're kind of just imagining a different post at this point?
"it does, actually"? you're going to have to clarify what you mean by "this post makes a justification as to why the concepts behind marxism are sound and good", unless you mean that "people thinking the ideas sound good" is your justification, which you just argued a second ago wasn't what the post was doing, and which is exactly what i'm saying is a junk justification
"Marxism is popular" this post very specifically makes the point that marxism isn't popular, but its ideas are. that's like the whole point of the post
also, "easily understood" what? we haven't even defined what sort of marxism we're talking about here
it says nothing about the reasons for negative connotations; you're adding that yourself
Eugenics [is] not popular
again, i've given two examples where the average person would probably support eugenics-in-description-only