I mean for people that are providing a moral defense of this? Yeah, no, fuck them into the sun.

But from a legal perspective, that's kind of the problem isn't it? Because no kids are involved in the actual production of the images, this creates a huge legal question - isn't this constitutionally protected in countries that have Freedom of Expression/Speech?

I mean this is obviously vile and this person is a danger to children... but would this be illegal in the USA and Canada and other countries that have freedoms that make it very difficult to prosecute this kind of speech?

There's also the wrinkle that it's being made of real people. Not just that it's kids in general, but real, actual, specific kids. Most countries have some form of "use of likeness" protections, but that's essentially making this into a copyright dispute, and a pretty grey one at that.