Does listening to metal have any negative effects?

[AnthroHeart]

I'd say if it uplifts you and doesn't give you violent thoughts, and doesn't bother anyone it should be fine.
I've heard others say otherwise.

If it falls away because of changes in viewpoint, then I wouldn't worry about that either.
I'm learning to let go of things that were once very dear to me.

Usually, I would think that kind of music would energize someone. If it causes you to act positively, then it can't be bad. It's how you interpret it.
The words themselves have the meaning that you give to them.

The Universe has no inherent meaning except what we give to it.