I disagree. I don't think everyone wants or needs a valuable job, and to most people, this is an unobtainable dream. The truth is that most people I've met doing menial jobs are happy doing them IF they have enough money to cover necessities and do something enjoyable outside of work and their employer treats them fairly. This means that in the balance, their life is meaningful, even if their employment isn't.

I also believe job satisfaction is completely independent of a job's contribution or value to society. Cleaning toilets has a definite societal benefit, but it is still menial work that requires little actual skill and is a job most people look for ways out of.