why? and NO!

I'm trying to haul my fat ass into the gym every day now, and got some advise from the best on diet and exercise etc. (my gay friends), and one put me onto Body for Life and is acting like a virtual whatsapp coach for me while I try to navigate through the intricacies of a book that is at once completely simple and at the same time too complicated for a beginner.

So this morning I do my first upper body workout.  While I'm doing a little warming up on the cross trainer, the bloke walks in.  You can imagine him, short, balding, glasses, quite a bit of a paunch, tshirt, bermuda shorts and flip flops.  He's accompanied by his son, tallish good looking lad, slim, with the faintest hint of a bit of baby fat on his belly, but slim legs, not fat at all.

So mentally I think, oh, that's nice the lad is along to keep dad company while dad does the private training. My daughter did that the other day, I was walking the dog with my son, she didn't feel like it, we didn't want to leave her at home alone, so she tagged along with a book and moral support and positive energy.

Nope.  Dad signs son in, gives him that cringeworthy pat on the back, here's a good lad kind of pep talk and walks out and leaves junior in the hands of the trainer.

Junior looking terribly uncomfortable and out of place gets put on a bicycle and told to cycle while trainer juggles the 3 other people he's training at the same time.   While I'm training, I watch him out of the corner of my eye as he gets moved to the x-trainer and then put through some weights and crunches etc.

All the time I'm trying not to be judgmental but I AM.  Here are some of my questions.
Why would a father who is personally in need of a major fitness overhaul get his son in the gym at such a young age (he couldn't have been more than 10) with a private trainer while he just walks off and leaves the lad alone?
Why would a trainer with any integrity accept such a child as his client?  I have to re-iterate, the kid was not overweight, was not out of shape.
Why would a father leave his son alone, and not use the time and opportunity to "do it together" and be together?
Why is this kid alone in a gym which expressly is for adults unless the kid is getting personal training?
Why isn't this kid doing what most other kids his age are doing on a Saturday morning - namely running around a football pitch, rugby field, basketball court, tennis court or whatever - in the company of his peers with other kids, with parents and kids all around having fun and bonding and sharing?

I really just don't get it.