Of course, protecting children is just a convenient lever to justify this giant overreach into everyone's privacy. The ultimate goal of these people is to minitor everything everyone does. Once the mechanisms are in place, they will be used. And they will eventually be used to their full extent no matter what assurances we are given at the start.
Your justification that the law will be easy to bypass if flawed, too. Passing laws that we know will be ignored or bypassed just destroys public respect for the laws that really are important. The new law is a bad idea from start to finish.