Minors shooting on private land shouldn't be an issue providing they have the appropriate juniors permit and are properly supervised and both have owners permission. My son has 19 months before he can get a junior's permit so I'll use this time to teach him some bushcraft, navigation, first aid and basic ballistics so he'll hit the ground with some useful knowledge. There's plenty of things for the boy to do when out hunting, he helps to spot and range the target and learns new words when dad both hits or misses

Personally I don't have a problem with kids learning to shoot as soon as they can show respect for the safety aspects, I had a 22LR and a 12ga before I turned 10. Those were the old days of the 70's where it was considered normal and part of growing up in the bush. The reason I don't let the boy shoot in this country is that by doing so without the proper permit the first thing he learns is dad is breaking the law which isn't responsible nor sets a good example. I'll do it all by the book when the time comes so it reinforces how important it is to be responsible and follow the rules.
The other reason not to break the rules by letting him shoot unlicensed is that kids have big giant mouths, if the teacher hears something and takes it the wrong way, I could be in a world of pain. My son has never seen the contents of the safes and knows that if the safe door is open he needs to get my attention so I can close it before he's allowed in. How many times have you told your kid "Don't tell mum" only to have them run up to mum..."Dad said don't tell you this but...." and I'm the one copping and ear bashing from the Russian Princess.