Agreed they make irresponsible choices sometimes, and we can think that policy can protect them, but we have no control over most of those choices when it comes to seeking behavior. Driving starts at early teens a lot of places anyway, and cars can be stolen, and the cost barrier to entry is super high. There're other separate regulations about weapons, and kids with weapons are already getting them from an adult or stealing them, barrier to entry is high for purchase. Sex you absolutely cannot control and thinking you can is absurd for germane topic of seeking behavior, barrier to entry is effectively zero. Drugs are illegal or stolen from the start so moot point.

The only way to really curb any of these seeking behaviors is to educate the child and give them some experience with it. Enforcing age barriers doesn't really work much for these, why would digital age barriers do much for media or anything else? You make responsible people out of children by educating them and giving them responsibility experience to make better choices, and some will always have seeking behavior and age checks don't really stop them... It just invades the privacy of the rest of us.