Yeah, and those are conveyed in part by influences. It rose up as a musical movement. That in turn developed some ideas from the past. But you've got a point. Let's talk about that.
If death metal was as Slayer put it NWOBHM and hardcore punk, then we have:
* Apocalyptic Worldview
* Distrust of Society
* Dislike of Morality
* Distrust of the Crowd
* Anti-Humanism ( death > morality, democracy)