If you have put something unpleasant behind you, then really it should not matter if details of it are still available for other people to read... In fact, if it does, then the matter isn't really behind you at all. if other people are going to judge you by your past, that's unfortunate, but that's also just life... It shouldn't be up to legislation to change how liable people are to judge books by their covers, as it were.... That's a moral failing on their part.
People need to live their lives the best that they can... everyone fucking makes mistakes, and we learn to live with them. I used to know somebody who was crippled for life as a teenager because he was being reckless. he could easily still be reminded every single day of his life, even now over 30 years later, of what he should have done... so you can't somehow say that the Internet is somehow different just because something online can last forever, because there's other stuff that can be just as interminable.