It eventually brews into anger as the war goes on, as Sirius and Remus are fighting as best as they can and worrying about Lily, Pandora, and baby Harry. Voldemort is killing people and his horrid death eaters are flanking him in those attacks. It feels like every night the couple are laying in their bed reading up on all the deaths of people they knew, people they cared about being killed and destroyed; some by people that they knew.