I appreciate the two sides of the coin being offered above,
I think Simon makes a strong point that mentoring young people inherently carries the element of friendship.
One thing is for sure, a kid going through the school system is going to meet all kinds of people. That is part of getting ready for the larger world.
If this teacher didnt embrace the JW world view, arent there are other ways for a JW parent to teach their child to handle that rather than yanking the child out of the music program in their school?
I dont know if this became a mild vendetta at some point for this teacher or not but whether or not that is the case, if something he says is true, then it is true regardless.
His statement that you dont make kids strong by the techniques the Org uses (isolating and insulating) seems like a good one to me.