Weakening encryption makes it easy for people in power to take advantage and, for example, installing software on the computer or router that let's them monitor what the victim in this situation does or says online. This doesn't even have to be a government or corporation, it could be the person abusing children. Weakening encryption gives software the ability to do that. E2E encryption strongly hinder that if not stops that ability. Not everyone grows up a loving environment. I urge you to look up statistics regarding the relationship between the abused and abuser in the majority of situations.

How far are you willing to take it? Given that most child abuse happens at home, and most abusers are family, it would seem that mandatory surveillance cameras in every residence would help quite a lot; much more so than anything you could do online, anyway.

Of course, this is also very intrusive, but if your threshold is "it's okay unless it's worse than the child abuse that it is likely to prevent", then it would seem to pass that. Unless you have other criteria?

I didn't say that. I said that this law will change nothing. I said that this law will have no effect. I said that this law will not reduce abuse.

And the cost of this big heap of nothing? Weakened encryption and mass surveillance, which will enable other, different kinds of abuse (mostly not on children so of course it's not the same).

Are you sure this is an appropriate price to pay?