From a letter to the Asbury Park Press:

There should be a law requiring every household with a gun (no matter what kind) to post a sign in a window or on the front lawn warning that there are firearms in that home. We post signs for security, letting thieves know there is an alarm and cameras there if they attempt a break-in.

The biggest reason for this advertisement is to let a neighbor know there are guns next door. If a neighbor knows this, then they wouldn’t let a 6-year-old play with a 4-year-old, who can take an unattended gun by mistake and kill another child.

I can think of several reasons why this is wrong, including some that would backfire on the neighbor.