Even if you did, you just lower the chances. I've created Netflix kids account specifically for mine. On its own it suggests also various documentaries on top of cartoons. We took the first one it suggested, and IIRC in second episode there was a very gruesome and detailed part with polar bear eating baby seals, one chew at a time.

One way to traumatize 4-year old, I'd say an effective one.

The knife and the knife maker doesn't have intentions to pump propaganda and porn into the childs mind. The internet is not neutral like knife. The internet has an actor on the other end (human or algorithm) that has certain intentions. Thus a child can be intentionally influence via the internet. A knife does not act on its own to influence the child's mind. So, apples and oranges. I'd argue the internet is significantly more dangerous to a child vs a knife. The internet wasn't built for children, it was never child friendly to begin with and we shouldn't mutate the internet to cater to children. Its best to treat the internet like a hostile force for a child's mind and keep children completely off it to begin with. Make it illegal for children to use a device connected to the internet, it is the parents responsibility. Same as guns. Its not the gun smith or gun sellers responsibility to keep the child safe from guns - its the parent's.

> I'm pretty sure most kids older than 12 do have access to kitchen knives. And actively use them too.

True, and it's the parents responsibility to ensure that children won't injure themselves with the knives, or take them out or to school or whatever.