Hermione wasn't sure if any of the victims from the explosion of the Leaky Cauldron had been innocent bystanders caught up in the violence of an attempt at revolution. Considering how popular an establishment it was, the chances were very likely. Even if there had been a large gathering of Death Eaters inside one of the back rooms, there were still potentially guests in the upstairs rooms or passersby on the street outside. Many citizens accessed Diagon Alley through the Leaky Cauldron. The Resistance was amplifying its aggression, not caring who it hurt in the process. Perhaps they were of the opinion that the ends justified the means.