It's not that it's a private thing, it's that it's yours to control. There aren't technical limitations to the use (just as there aren't technical limitations

It's not that it's a private thing, it's that it's yours to control. There aren't technical limitations to the use (just as there aren't technical limitations to copying and freely distributing all digital media), so we either institute legal limitations or accept that it's allowed. There are many negative aspects of allowing it, so we should probably make sure we take the time to look at the repercussions of both stances carefully (that is, more carefully than "I don't have a problem therefore allow it").