Who controls your age if you try to buy alcohol.
Who controls your age if you want to see an R-rated movie?
This is simply extending the same level of control to the internet.
More control for parents is a completely different level.
Disingenuous, but I'm sure you know that and were being intentionally so. The government is not using alcohol age laws as a justification to place a camera in your bedroom to make sure you aren't sneaking booze, but it is using internet age laws as a justification to surveil your entire life in a world which is becoming increasingly digital-mandatory to participate in government services or the economy. Nobody had a problem with internet age laws when "are you over 13? yes/no" was legally sufficient.
There are no laws preventing children from seeing R-rated movies with or without their parents, theaters implement that policy by choice.