I used to believe that children were born pure and innocent. Then I became a parent. Now I believe in original sin.

When my oldest son was about three years old, I was outside doing some yard work. I took Kevin outside to play while I trimmed the hedges. Holding his hand, I knelt down beside him so that we could look at each other face to face. Slowly and carefully I said, "Now, Kevin, you can play here in our front yard. You can go next door and play in your friend's front yard. You can ride your Big Wheel up and down the driveway. You can go in the back y…