Last night, I get home from work and my nanny greets me with very disturbing news. It probably didn’t make the AP or New York Times wires, and I question the national importance of the event, but at least for my immediate environment, it was major news. It seems J. my 2 year old boy was out playing with his friend — another 2 year old boy (let’s call him “Bill”) from the neighborhood. J and Bill are best friends, if pre-language kids can be said to have best friends. They have a standing play date nearly every day, and...