This is not enough because in reality (I guess) most parents do not bother with setting this up (or don't know how to do it) and as a result kids stay unprotect

This is not enough because in reality (I guess) most parents do not bother with setting this up (or don't know how to do it) and as a result kids stay unprotected. Maybe there should be a law requiring to setup such settings and a one-click option to switch to restricted mode without having to toggle every checkbox.