Many politicians don't have a clue what the technical consequences will be. They just see that the law is meant to protect children and then they don't ask for clarification on the technical details.
Nah they just see it as good ratings and votes. Most democratic politicians are in a popularity contest, doing objectively good things doesn't matter in the slightest in a democracy.
I don't think anyone realistically believes that this helps save any children. That's just an excuse used to make it sound like there's some good intention behind it.