I think there is an inherent assumption at the heart of this logic that, when questioned and revealed as false, causes the entire argument to fall apart. The assumption is that because somebody believes that their job is "bullshit" or pointless, that their own assessment is actually correct.

Usually when people I know moan about how useless they are and how boring and pointless their jobs are, they are reflecting on inter-office politics, easier methods that could and should be employed, and a host of solutions that could render them useless. The only problem is that for whatever reason, those solutions have not been pursued and somebody is willing to pay them for their services.

It doesn't really matter whether you as the employee see the point in your job if the person paying you sees the need. It's important to remember that when you assume that your job could even be eliminated, you are making an assumption without necessary data. After all, you were hired because a need existed. In other words, I think people in many jobs underestimate their actual economic value to society. Like it or not, most artists don't actually contribute a whole lot of economic value. That is, they don't create wealth for other people. Those who do are usually compensated accordingly.