There is research and papers showing that heavy music in general can actually be therapeutic and make someone calmer, rather than the perceived opposite effect. It can be a great outlet. I listen to metal, heavy music, all the time but when I have used it as a coping mechanism, i.e. an outlet for stress, it has definitely allowed me to release such tension. Not only that, but singing/screaming to vocals along to the music surely does release all of energy, and while there are outsiders who might perceive the music as ‘angry’ the incorrect connection they’re making is that anger is an energetic emotion, as in unreleased energy/tension. Metal isn’t angry music, it is energetic. That is why it makes such good workout music. It stimulates and satisfies that part of our lives, letting us be some of the ‘nicest, most wholesome and fun people all around’.