Sadly, whenever someone makes the points you've made, the age old argument surfaces. "Hey, they knew what they were in for when they took an acting job! You want the fame and fortune, you take all that goes with it." This is, to a point, a valid argument. When you accept fame, you accept fans and critics alike. You must expect people to interupt your daily life asking for autographs or telling you how much they adore whatever it is that you've done. On the other side of the coin, you must also deal with the slings and arrows of those who do not adore you for whatever reason.
In my opinion, as long as people keep the praise and damnation contained to your work or what you choose to share, that is fine and acceptable. Digging into the past, paying past aquaintances for old info on you, spying on your every move, going through your trash....., these are ethically questionable at best and persecution at worst.
However, when it comes to the judgement of past mistakes, this is not what the press does. We do. It's the public's reaction to things that make or break a story's importance. We are the final judges as to a performers fate, we cast our jury votes with our dollars. If major studios thought millions would flock to theaters to see Miss Doherty in a summer blockbuster, that is just what she would be doing. Sadly, they don't. Just as we made them think this, it's us that must make them change their minds. How? That's for an entirely different thread elsewhere.
.....Holy crap! Did i just write that? Jeez, not one joke in that whole mess. I must be losin' it!