I say ANYTHING can be bad if YOU lose control over it.
You lose control over alcohol, alcohol becomes evil.
Similarly you lose control over fast food or food, it becomes evil and you become fat, oily and unhealthy.
You lose control over Justin Bieber, you dream of him, you eat him, you breathe him, you smell him and you want to touch him. But hey, Justin Bieber is ok if you don't lose control.
What is good and what is bad is very subjective. This is what I always believe.
But of course, please don't go rape, kill or steal. These are completely unacceptable in our society.