Not the person you are asking, but I can already guess what their reasoning most likely is gonna be.

Get a large sheet of paper and fill it with buzzwords like "tiktok", "groomers", "CRT", "lgbtq propaganda", etc. Throw a few darts at it, and you should get a possible semblence of the reasoning I would expect the grandparent comment user to give you.

I always try to give a poster the most charitable interpretation possible and steelman their argument before even considering making fun of it. But I legitimately struggle to come up with any charitable interpretation of an argument that claims "underage users browsing internet without state-mandated age verification is more dangerous than them working in a meatpacking facility or a slaughterhouse".