Because they subsist off government waste. They know damned well nobody in their right mind would give them a real job they would deem “worthy of them.”
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most of them collect trust fund money [ many collect north of $40k month, along with their hourly protest wages ], and have no need of a real job.
While you are correct that trust-fund babies would do as we see, methinks you wildly over-estimate the number of them. Former and threatened bureaucrats and teachers alone greatly exceed that total.