And thus, "stupid." One of the necessary components of intelligence is the ability to plan for the future; looking further ahead than the next immediate move is something that stupid people cannot do.
That doesn't really apply to D. Us puny mortals have to plan to survive whatever changes the future holds. But D will exist literally forever, infinitely. Change does not threaten her existence like it does to us, so change means little to her. Even when her slacking off catches up to her and she has to go back to work, it won't matter to her, because there will be another chance to start slacking off again some other time. And another, and another. Infinitely.
A future full of both infinite work and infinite leisure.
And therefore, both infinitely meaningless. So all that matters is now.