[Arubis]

Source: none, this is my pure supposition and projection.

Power. The sensation of raw power.

By and large, the best way to eliminate DST would be for one or more sufficiently powerful lawmakers or political executives to say: this is no longer benefiting the public at large, and we are going to stop!

These are the folks empowered to change the date on which DST transitions (at least stateside). These are also the same folks whose careers have been mostly defined by the deliberate and incremental accumulation of power into their own hands.

If you're wired for that kind of desire for power, the ability to tell the entire country: okay, I am changing time! It happens on this date! --must be simply _irresistible_. I mean: you're literally changing TIME. Hot shit! The entire population has to respond! You're changing TIME! Why give that up?

While I'm storytelling and presuming, I'll note that this needn't be a deliberate, conscious decision; I'm only suggesting that the people positioned to change this sort of thing are probably naturally wired to resist doing so, and may not even be aware of why themselves.