I suppose I could argue that some ditches don't really need to be dug, but I'll save that for another time. ;)
I think it's a highly complicated set of questions to which no-one has the answers.
Yes, I agree to both.
I think part of the complication is that we aren't talking about just one thing. There is a big range of difference in abuse and safety. And moral taboos. And that's not even getting into the differences of opinion about what constitutes objectification, and disagreement over the effectiveness of prohibition.