A bit sad other knowledge workers feel that. I know my job isn't anything trying to better humanity; I just make video games. But making those games (or rather, the tools to make those games) has an end result to have people enjoy themselves a bit in a decreasingly enjoyable world. So there's my fulfillment.
But I understand it from a blue collar perspective. I tinker at toys in a metaphorical basement and I live a cushier life than many who give their bodies to their duty. That doesn't feel fair at all. But I mostly wish that was motivation to band together and get blue collars paid better rather than cause this inter-class divide while the capitalists ransack all of society.