Americans want kids shielded from the internet. They don’t trust websites or the government to do anything about it

You know that pop-up. The one you click “yes” for every time. The one that asks you to confirm you’re over 18. Sometimes, “you must be older than 21 to enter this site” is written in big, bold letters. Other times, in a somewhat sobering moment, you’re asked to scroll back for what seems like eons as you find the year of your birth. Maybe you put your real age; maybe you’re lying and claim to be younger than you are (who’s going to check, this silly little website?); maybe you are underage and...