https://deathworlders.com/ - Dunno if it goes into that detail of us evolving from violent apes, but at least from chapter zero, seems to be mostly due to us being from a “high gravity” world and having “builtin combat drugs” (adrenalin)

Considering the amount of things that can kill us, both micro and macro, and the fact that we ingest poison (alcohol, drugs and even actual frog poison) for fun, it’s pretty easy for any alien life to look at us and think “holy shit, those creatures are fucking hardcore!”