Why everyone say that Amy destroyed her life ?

I hate when people say that she lived a sad life being victim of drugs and alcohol ..Maybe she had too many problems with her life and too many sad moments .. i know , i am sure that she was lonely , she showed us this in her songs ( like in "Rehab") but she had happy moments too .. she was a real 星, つ星 and i think like all super stars she had happy moments in her life ..
So many people say to me that i just can't accept what happened with her .. but seriously , that's stupid :(
is that true ??