Neurologically, it might actually be justified—there's a recent hypothesis that we're wired to "decrease uncertainty" more than any other terminal preference, i.e. that "being productive" (in the sense of doing things to ensure that a situation will resolve a particular way) is an end unto itself, that we pursue regardless of whether it makes us happy. (I like this hypothesis because it neatly explains why the experiences of happiness, of contentment, and of motivation, are all effectively orthogonal, and many people can have one of the three while never having the other two. It also explains why people tend to feel relief when a negative event they've been attempting to prevent finally happens anyway.)
As well, there is a reason that Buddhism's viewpoints on dukkha and nirvana needed to be invented/discovered and taught (and that people struggle to learn them.) The idea that there is a happiness that exists as a state of *being8, that does not involve "doing", is not, seemingly, an instinctual belief among human beings—or even one that's very easy to convince people of.
