Does listening to metal have any negative effects?

[EvolvingPhoenix]

Hey guys, for all I know, this may be considered a dumb question, but considering that I'm learning to look at things in terms of energy, frequencies and vibrations, I'm wondering if listening to metal has any negative effects I should know about and how seriously should I take it? I LOVE metal.

Some of my favourite bands aren't exactly positive either.

For example:

Pantera (Favourite album is Vulgar Display of Power, which features a dude getting punched in the face on the front cover and my favourite song off of it is called "Mouth for War")
Nevermore (Prog metal band with a dark sound and mostly depressing/dark lyrics)
Nine Inch Nails (Not a very positive sounding band)
Rob Zombie and White Zombie (both have a lot of surreal horror lyrics and stuff)
Alice in Chains (My mom said they sound like a funeral dirge, just to give you an idea)
Rammstein
Ministry (can get pretty angry/aggressive)

These are just SOME of my favourite bands.

Not to mention I'll listen to some pretty hard hip hop, like NWA.

So does listening to this stuff have a negative effect? Should I be worried? I really love this music, even though I'm becoming more and more positive and the lyrics are becoming less and less relatable.

So what kind of effect (if any) does listening to this kind of music have and what ought I do (if anything) about it?

Thanks in advance,

Nate