Why was this downvoted?
I do see it in maybe a less overt way in a lot of comments on HN. There are comments in this discussion blaming a lack of social programs in the US for the problem. Things like that. There's nothing wrong with believing that, but the counter arguments don't get much visibility around here.
I suggest reading chapter 2 (starting at "Abolition of the family!") for the first, and chapter 2.3 and 2.4 for the second.
I don't believe Marxism is a primary cause.
While I don't really know anything about Marxism, I doubt it baselessly advocates for the removal of family structures without something to replace it like community engagement
It's annoying to hear people preach about the woes of Marxism, because, and this is a biased US perspective, a very small proportion of left leaning individuals would ever describe themselves as Marxist. People doing so would be seen as holding extreme opinions. Hearing fearmongering about communists comes off as a red flag that someone's out of touch with reality and fearful of the amorphous blog that is "the left". It comes off as an implicit strawman. Attacking Marxism as means to undermine the credibility of the left is eye-rollingly tiresome to hear. And yeah, of course, comes with plausible deniability. Nothing good will come of that comment but an unpleasant debate of predictably mainstream left folks arguing semantically that marxism doesn't matter, a fringe actual marxist doing their own thing, and a conservative viewpoint playing off both to say "look there's marxist" or "well I saw this extreme opinion on twitter so no".
Marxism and Marxist-influenced movements are also very represented in academia, which naturally makes them influential among the literati at large.