Is... is it... is it hypercapitalism crushing their lives? Because it sure seems like long work hours, zero job mobility, high cost of living, enormous stress, and the resulting social, cultural, and interpersonal alienation might be a factor.
Idk though i'm just a marxist gonzo anthropologist.
They just need even cooler anime to tell them to fuck.
I feel like Japan is heading the direction of forced birth tbh. Like, any 100% Japanese person capable of giving birth must have a child every X years or go to jail. The racism is way too strong and with the recent influx of immigrants the (admittedly very translucent) mask has just about fallen off completely.
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: