Horror and anger definitely have crossover. Look at the people who are “punished” by the monsters of horror films and you will quickly realize it’s just catharsism in the form of gross justified violence against those that are deemed as either corrupt to deserve it or pure innocent that iS being wrongly punished by the sins of the society. (look to toxic avenger for a super on the nose representation)

But metal music is often in search of that same catharsism of feeling alive, yelling back against the things that make you angry or scared and loud and hard enough to hear that you can’t think or focus on the merits of the song.

I understand it’s a large oversimplification and it’s not really my research while I have a distinct interest in it. But metal music can not be compressed into a repeatable chorus like clean happy pop music can be, and if you look into the topics and lyrics of popular heavy metal music you will often find them to be secretly about some polarizing topics.

And honestly you kinda stated my point on you take notice of lyrics that give you a strong emotional response. You don’t have to necessarily fit the curve because it’s more about averages than catch all statements.