Speaking personally I don't know if its something I'd bring up to them, but if the topic comes up naturally I'd be honest about doing it and my moral reasoning for doing so. If the kid shows an interest or a curiosity about it then we can sit down and I'd teach them my ways. I took some stupid risks while I was still learning that I'd like to spare them from taking. Besides as you said it is technically illegal and if they are going to do it then it's best that they be doing it safe. Especially seeing as they would likely be doing it in your home.

Young and didn't have any money. Certainly not enough to blow on movies or shows. Since then it's been a jumping off point into learning more and more about computers. Networks, data transfer, Linux, virtual machines. I'm looking to get some certifications and get into IT now, and I probably wouldn't have the knowledge to do so if I hadn't spent my years on the high seas.