As roer said above "Nobody is trying to argue whether child abuse is a problem or not.". You just built a straw man argument around something that isn't even being discussed.
The only suggestions I see are things like Chat Control and things like "how about be a better parent". In practice, neither of these work. Chat Control we lose out on too much privacy and get dangerously closer to 1984. "Just be a better parent" is basically the strategy we have now, and it isn't working. I wrote in another comment what happened to my niece, I won't repeat it, but TL;DR as a parent you don't know what you don't know and your best efforts can go in vain.