Recently invented encrypted chat rooms allow people to coordinate and transfer CSAM without any government official being able to infiltrate it. And just being able to freely discuss has been shown to make the problem worse as it facilitates knowledge transfer.

This is all completely different to in the past where this would have been done in person. So the argument that we should just do what we did in the past makes no sense. As technology advances we need to develop new techniques in order to keep up.