Indeed, because daylight savings actually kills people. For a few weeks after a daylight savings change, vehicle collision fatalies noticeably increase, along with other serious accidents. It's simply due to disruption of sleep patterns, which takes a few weeks for people to adjust to.

In this crazy world, nation-states would get rid of time zones, but keep daylight savings. And the sweaty nerds of the world would all fall on their knees, raise their fists in the air, and yell in frustration.