Why Amy Winehouse's Death is so disturbing?

The death of Amy Winehouse did not come as a surprise to me at all as i always felt she was going to end this way.  She had been rushed to the hospitals on so many occasions and near death a few times as well.  However, It saddens me because we all watched as she was going through these tough times but yet no one was able to help her or hear her cries.  


It is not the first time that a rock star died from drug overdose and definitely will not be the last but it just gets more disturbing with every single occurrence.  She could have reached for the stars because she had talent but yet drugs and alcohol took all that away from her.  


I've never been an addict or been on drugs so I would like to know how hard could it be to quit drugs that you knew could kill you if you overdose?