holytrousers I'm not gonna say you are wrong. I'm just thinking back to my experiences riding in traffic as a kid versus commuting for 28 years as an adult. I think the mirrors would give them the idea that they are part of a traffic peloton in which their movements affect others, and others movements affect them.
When I was a kid in Chicago in the sixties and seventies I never saw any cyclists with mirrors. And I think about the way my friends and I would weave in-and-out of traffic without a care in the world.
Not to sound like an old fart but It's never too early to teach good traffic manners and good citizenship... and mirrors and circumspection are the building blocks of both.
Nope I guess I do sound like an old fart...but that's how I feel.
In any case, it's a good program program, and it gets kids out and active.