As to your second point, wiretapping laws already exist.
[1] I could actually see an argument along the lines of "the internet never forgets", "having nude photos of yourself online sucks", "14-year olds do stupid things and should be protected from themselves". However, it's not at all clear that destroying the 18-year old's life is the best way to "fix" this. (It's also quite possible to have different rules for supposedly private messages and public distribution.)