roid rage has been attributed to the highly androgenic steroids -- trenbolone, halotestin, even testosterone.
like the other guys said, 'rage' is a latent characteristic that can be exacerbated or amplified by steroids -- it's predisposed and is something that you should be able to control. if you think you're going to rage, you probably will.
imo, the same thing goes for a lot of the other sides attributed to other substances - 'anxiety' on boldenone, 'dry joints' on stanozolol, 'deca dick' on deca, etc. like sports, steroid use is mostly a mental game.