You’re insinuating a cause here, but I honestly don’t know what you think it is.
I'm not "denying the author use the national identity." I'm wondering about is why the author would deliberately fail to examine a full half of the population. If you think that's problematic, I guess I'm okay with disagreeing with you.
The story further goes on to completely ignore the supply side: what jobs are available, and why don't "prime-aged males" want them? Is that an interesting story? Maybe, maybe not, but I'm sure there's nuance to be found there. But no, "Americans Are Losing Their Work Ethic" is easily supported with some cherry-picked charts and that's way easier to write about.