They were actually one of the only political factions that seemed to try and hunker down and just survive outside of the war, but were stuck within Germany, without ever trying to collaborate. Meanwhile: the Communists either died or joined the Nazis, and the Socialists just mildly complained that they weren't in charge.

Honestly, the DemSoc complaints in the war can be basically summed up with: "This isn't real socialism! Gobbels is lying! The economy would work better with Socialism that was funding what I want!" and that's about it.