Tell stories of a Star Trek-like universe (people generally get along, not war all the time) taking place in a galaxy colonized to Kardashev level 3. Most stars have Dyson spheres (swarms) around them. We probably need FTL travel and communication.
Assuming a person requires an average of 4 kW of power (including energy cost of agriculture to grow their food), a galaxy's power output can support a population of 10^34.
If this were instead a Star Wars-like universe with such a population, a quadrillion deaths would not be a big deal, proportionally less (much much less) than 1 person dying on our planet of 7 billion.
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