They're certainly acting the way you'd expect warriors who've been fighting for thousands of years to act. But genocide is genocide and I imagine Hickman will add context to their actions to give them some kind of humanity, or simply handwave their atrocities. Though I agree most of the Swordbearers likely aren't outright evil, just victims of rough lives who reproduce the violence that shaped them. Those are traits they can unlearn and if Marvel does plan on pushing a Storm-Death romance I think there's room for that to happen.
They certainly come across as brutal warriors, so their sense of morality is entirely different from a regular person's lol. The Arakkii are driven by the same core value of reunification that the Krakoans are so I think we'll see that while their methods are tough, at least some have the right intentions. Death could be one of those well-intentioned warriors who's not interested in the plunder and just wants to do right by mutantkind, his mother, and his own beliefs. I think you're right about trading places, maybe Death joins Storm on Krakoa or she joins him on Arrakko?