Are you suggesting there's a global cabal of executives colluding to create bullshit jobs to keep the populace in check? Absent that, I doubt this is actually the reason, because it suffers from the free rider problem. If you spend money keeping workers occupied, you'll be reaping the benefits (them not revolting) but so will your competitors who aren't spending any money on such jobs. Prisoner's dilemma would suggest that companies that don't collude would defect, and none of them would be hiring for bullshit jobs.
* note how "free" the market was before the great depression and the subsequent regulations that followed to stabilize things, then repeal of said regulations that lead to one financial collapse after another (savings and loan crisis, early 2000s financial troubles, 2008 financial crisis etc etc)
The real problem was not a fixed currency supply, it was the sudden contraction in the currency supply which caused people to over-react and hold onto currency too tightly. It self-corrected eventually as the panic subsided and investments resumed.
If banks had enough deposits to pay all depositors, bank runs would not have mattered, there would not have been a panic and there would not have been a contraction in the currency supply and there would not have been an economic depression.
I don't know if pure capitalism can work without any regulation but manipulating the money supply is definitely not the solution.
However, if you don't buy the "capitalism is always right" Ansatz, then it's quite easy to see paid BS work as yet another market failure ... or worse, as a way to keep workers busy so they don't cause trouble for "the system". Which I believe was one of Mr. Graeber's main points.