darje, why are you so worry .. let them have fun and be creative .. people like that helps develope/improve computer security .. so those people selling computers and software will take seriously of the security of their product while keeping the "user friendly' enviroment.
For home user patch your computer regularly and update your virus patern and protect your ports with firewall. (which I dont do this myself
)
Sometime ago.. even Microsoft stop production and development for 6 month (I think) just to focus on security issue in their software..and look serious into the security of thier software .. I think it was before they lauch the .NET. But yeah .. those are not easy.