First of all, that's a weird goal to have. Children are people. Let them be interested in whatever they want.
Buuuut, if you want them to get into programming, then discourage their computer use, and tell them to go play outside or something. Tell them that Linux is bad. And tell them not to go near the internet, and "whatever you do don't look up SNES emulators on the internet. Don't go to anynowhere.com and get really into Noctis."