Because people understand or at least think that she isn't normally like that unlike other stars that are always violent.
Let me say one thing. Newspapers and the news on TV was brought about by our right to know more about current affairs in society today. The Paris Hilton incident annoyed me so much. She made a sex tape, a personal and at the time erotic thing to do. Her 'hubby' sent the tape out and made it public, she then had to apologize for it! We choose to look into the personal lives of every person who achieves remote success and then penalize, embarrass and ruin those who we expose!
It's disgusting to think that we financially, mentally and some even physically harm those who try to live their lives sometimes on the edge just because we are jealous or insulted. I say, to those who say they feel annoyed and insulted by silly mistakes that famous people make, get a grip and stop punishing those who you choose to focus on and expose! You are the real wrong doers but are too pathetic to admit it.
If people like Paris Hilton and Cheryl Cole make mistakes, let them deal with it in the way in which you would want your children to deal with it. On their own, not via public embarrassment and bullying. It's up to you what you expose your children too not them!