This isn't about learning photography, for kids it's about being retro/hip/individual.
The fact that their pics come out like shit, under exposed, over, out of focus, etc will only add to it like paying extra for ripped, washed jeans or punk music played badly.
For some it might be about being hip, but some might be inspired to continue expressing themselves with a camera. I am not so cynical to think that all kids are mindless followers of fashion.
My first attempts at developing photos were less than perfect. That didn't discourage me. I learned from my failures. Chances are good those kids will make the same mistakes I made. The committed won't be discouraged.