Quite wise, yet that could put you on a watch list in some places with the increasing laws against leaving any child unattended: http://www.freerangekids.com/laws/
I don’t believe in “free range” children. My children were closely supervised. That was just one unique incident where I was around the corner watching. He just did not see me for a second.
I met one of these free range mothers at a dinner party one time. What a true wacko! She sent her young daughter to play in an alley out back, populated by homeless men and thought she was so cool. I about took her head off.