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The statement “These are child safety laws” premises that the laws would save children - so the way to refute is to ask for proof. Outside of vaccines I doubt there is anything concrete that will directly benefit children. There is no argument that holds up to scrutiny. They also don’t have any good way to measure safety, though Goodhart’s Law would have an impact.
>Outside of vaccines

Will you allow an argument against this?

I mean, I want to show an example where it is only a problem when someone else is not as convinced as yourself, one way or the other.

>so the way to refute is to ask for proof..

No use. The same proof will not be convincing for everyone. Let us take vaccine. The proof for a Vaccine for X saving Y lives is often the following.

"Before the vaccine there was Y deaths per year from X. But after vaccines there is zero deaths from X".

The implication is that vaccines saved X lives. This could convince most of the people. But someone can ask. Are those kids who are not dying of X (thanks to the vaccine), are dying of something else?

Now the picture is not so clear.

See, same data, different results depending on how deep you want to probe,