Additionally, I'm glad you weren't afraid to hand your son the real tools and let him build and break stuff. For some reason with programming, so much of the curriculum (even for adults) spends a lot of effort to hide away the things that are perceived as too difficult (e.g., pointers, memory allocation, etc). For children in particular it seems to be the actual code itself, and so we have things like scratch. It's quite refreshing to see a parent go against the grain on this one.