Luke Skywalker seemed more distressed that he couldn't pick up some goddamn power converters than he did after taking hundreds of thousands of lives by destroying the Death Star. But those were all evil Imperial types, right? But the second Death Star was still under construction when it got blown up by the Rebels. Surely a lot of the people killed were merely civilian contractors who probably didn't even have sinister British accents. This point was famously debated by Dante and Randal in Kevin Smith's Clerks.
George Lucas actually addressed this problem. In Attack Of The Clones, we learn that the disgusting bug aliens the Geonosians were the ones who designed the Death Star. In the DVD commentary, Lucas suggests that this resolves the complaint from Clerks, since they were "probably contracted to build the Death Star." Of course, this directly contradicts the previously established backstory that the Death Star was built by enslaved Wookiees. (Some with diarrhea.)