For example, how many children will this actually protect? How many children will this harm? How many adults will be harmed by inevitable side-effects that arise? Those questions are not discussed or even considered.
You can't win a debate by claiming your concerns invalidate their concerns. You need to actually engage with them on the issue they care about.
The end result is that even the children you're trying to protect are now under permanent surveillance of an authoritarian government where sex trafficking probably still happens, but the law permits the government to wrongfully ruin more people's lives than are saved by the claimed "noble" act.
No one is advocating for this. You're creating a straw man argument and those type of arguments are never persuasive. Once again, if you want to actually end this debate once and for all, you need an actual argument that can persuade people to your side.
> For the people who genuinely care about this issue, an obvious response you will get is "how many children are you willing to allow to be sex trafficked to preserve your privacy?"
I think you are confusing genuine caring with political radicalization. The behavior you're describing there isn't that of rational supporters but rather inflamed zealots.
I can admit that your concern is perfectly valid, even share your concern, and still oppose your solution if your solution won't actually work. In fact, I would argue that I have a greater concern for the problem, because I care enough to worry about actually solving it, instead of just doing some ineffective measure that looks good.
That's at the level of reality, though. At the level of how this gets spun in media and politics, it doesn't often work that way. Performative action too often rules the day. Recognize it for what it is, though - performative. Asking if the solution actually works is a valid real-world response, even if it doesn't play politically.