Think of the children has been a rallying cry for this since the 90s.

It comes back to the argument: "Why are you opposed to this? Do you have something to hide?" It's easy to paint this as an easy way to catch pedophiles. It doesn't matter if this is actually true or if these arguments really hold up, by they are easy quips that can be thrown out that aren't easily dismissed with an as easy to reply quip.

Basically, the position comes down to: do you want to stop pedophiles, or do you want to make it easier for them to hide?

And yes, you can rationalize all day long about how that's not accurate and this and that, but then your arguing that most people are willing to sift through al the data instead of just going with something that at first glance seems reasonable.

Children's safety online has been an excuse for excessive surveillance for a long time. Not so long ago Apple was going to scan every file on your device for this reason.