This is definitely a good iniciative from Wal-Mart, raising the age restriction for purchase of firearms and ammunition to 21 years of age.
Showing by example what to do to try diminish the number of people with guns in their hands.

This is probably what was missing in the US problem, because everybody speaks about the guns problems but no one does anything about it. And then Trump starts to say some nonsense, like putting a gun on teachers hands.