Because the law isn't about protecting kids, it's about government control of the internet. Teach your kids that you don't want them watching it and why. Realize that you can't shield them forever.So you got enough sense to realize you xan only control what’s on your house, so why is it a helluva thing to put social parameters in place to protect kids once they step outside your front door.
Also, the law doesn't work for mobile connections, so it's useless outside the home anyway.