It's a consequence of the stupid firearm lawn in the U.S. which let anyone buy guns legally.

The word is LAW not LAWN. And the excerpt I copied from your reply which you insists you don't say, says in part "let anyone buy guns legally" Which is untrue. Yes I'm aware of how gun crimes happen in this country, and of who underage people are. Guns can't be sold to anyone underage in this country with or without and adult. At least from a legal gun store. They can be bought from criminals.

You don't just walk in and buy a gun from a gun store like a pack of gum even if you are an adult. There is required paperwork, and a background check.

The news you mentioned and the courts all know that. Everyone knows that over here.

I can't speak on how easily kids can get them from their homes since I would have to go into every home in America to find out.

However if you have evidence that ANYONE can buy guns legally, as you stated. please do share your source. I'll wait.