BHelmet said:
I would venture to say that if a band/song is rocking double kick pedals; an uber distorted fast mute drop-D strum; the singer is screaming out the low guttural "I have just been knifed in the stomach" angst-rage sound and the tempo is the heart rate of a meth head, well, it is not going to matter what tuning frequency is used. That sound is going to open up a pathway to violence and snarling rage. And I also would opine that no amount of so-called uplifting lyrics are going to ameliorate that sound/pathway.
Personally, I've found quite the opposite.
I've been a 'metal-head' for a good 30 yrs now, and offer a different perspective for you to ponder over. Frankly I've found that the metal community, fans, and concert goers have never been anything but friendly, polite and non-violent. Despite the perceived outside 'angst' which seems to come across from the music to those who don't like it, I can asure you that it positively relaxes me.
Maybe this is happening: maybe those who resonate to metal, find that the music itself cancels out the 'violent/angst' aspect; whereas for those who don't resonate to this music, when they listen to it, it merely activates the 'violent/angst' program.
So perhaps it depends on what frequency of music you enjoy - if you enjoy metal it may deactivate the same programs that are otherwise activated if you are a non-metal fan.
And that's the same with all musical types. Frankly, I find a lot of fairly quiet 'pop' style music almost unlistenable as it almosts make my body grate, like I'm having a tooth drilled at the dentist.
I don't think you can make blanket statements about any musical types creating violent people - I'm sure if you were to conduct a survey of many serial killers, and violent offenders, there would be just as many Elton John fans as Slipknot ones.
just something to consider.