What I can say is this...kids are a distraction...in a place of ATC with the amount of traffic that goes through JFK what if the kid fell off a chair and broke his arm? You dont think daddy is going to stop looking at the green tube to help his boy? The kid will most likely be screaming his lungs out from the fall and broken arm...it would be nearly impossible for the other ATControllers to do their job efficently. For that few minutes hes not looking what if something happened to an airliner? Hundreds dead...how do you explain that?
This time it was all fun and games and it was a break from the rigorious routine of the same thing everyday I get that....ive logged close to 1000 hours of flight time and the same thing over and over again sucks sometimes...but like I said...this time it was fine and nothing happened...but you never know what might happen.
You should have the knowledge to not make statements like this.
Go visit a tower cab because if you think there are green screens and radar positions where the local controllers work (Ground/Tower positions) you have not only misconceptions of what ATC does but what also they are capable of doing for you.
You'll most likely find a BRITE, a light gun, a few radios, phones, binoculars and swivel chairs. There will be a light board or screen controls for all the airport lights, navaid and approach equipment. You'll also find regular Joes who are very good at what they do and know what is and isn't safe. Kennedy is a little more sophisticated with an ASDE for ground controllers. You see this at airports where the ATIS advertises you to keep your transponder on while on runway/taxiways.
If your idea is what you eluded to you are doing yourself a disservice by not taking a visit to a TRACON and Local ATC facility.
As for the rest of your ideas of how things could go awry with a kid in the cab I think your misconceptions of what ATC does contributes to what you see as a grave danger when such a danger does not exist.
This is from a fairly busy tower cab and is a participant in the Big Brothers Big Sisters program. If you think a controller would put airplanes and those on them in danger then I don't know what to make of that. That is not the case and I think you can see the excitement in this kids eyes that he has a chance to be there.
