Personally...in my opinion...when we are in the thick of someone else's addiction our anger is justified. It could be directed at user friends, dealers,..... Anyone, basically, who enables our addict. But the truth of the matter is we who place the blame are also enablers until we pull ourselves out of the rubble. I remember when I realized that the anger really was at myself. But living in anger is no way to live.
Learn how to let go....truly let go. It's a day by day process...sometimes minute by minute. Hugs!