Just an opinion from a member of the flying public:
You should stand behind your employee. After hearing the facts in this case, it really seems that it has been blown out of proportion. We are becoming such a nation of tightly wound idiots. It would be a crying shame if someone lost their job over this situation. He's obviously very good at his job or he wouldn't be working at JFK. I feel completely confident putting myself in the hands of the air traffic controllers at JFK, whether they have their children stop in for the day or not.
What our children need to develop into independent, well-developed adults is another subject all together. Exposing your child to your workplace and responsibilities is a wonderful way to help them understand the realities of life and their developing role as a contributing human being. More people should do what this parent did. Kudos to the other people in the tower who recognized this and helped enable it to happen.
Child in Control Tower