Sentiments like "people shouldn't be doing jobs that can be automated" or "machines should do the work instead, we need more useful jobs for those people" stink of the ideas that 1) people must serve some societal purpose, 2) that they are not fit to decide their own purpose, and 3) they are not fit to determine what has value to them.
These values are actually now embedded in U.S.A. policies and major non-profits, like "No Child Left Behind", and the Gates Foundation, or "School to Work". (A tangent: we aren't enabling people to learn and to think, we are teaching them to follow directions. Curiosity seems to be a waning capability of many kids and we seem to be slipping towards a Soviet style of teaching in public schools - which discourages self-generated thought and questions.)
I'm not bringing this up because I'm a Luddite. I rather like the idea of automating things, actually. I don't think our current, popular, justifications are healthy.
Rather, on an interpersonal level, I think some of the justifications in this thread are codependent, controlling, and uncaring.