Their motivations, however misplaced and due to misunderstandings, are about fairness, justice and functioning government. The simple truth is that, to many Americans, the idea of "working from home" means "not really working".
They believe that people in the office will do real work, whereas those same people at home won't. It's a wrong and harmful worldview, but it's not malicious or coming from a place of contempt. A solid "never attribute to malice ..." moment.