Daylight Savings Time? The purpose has always been clear to me: A significant hit of excitement for 10 year old boys every spring when they can go out and play after dinner. This is a non-trivial addition to total human happiness if you can swing it. Even the "fall back" brings one strangely foreshortened afternoon. Boys love strange anythings.
But then the green eye-shade types get hold of it, and discover, of course, all kinds of hidden costs. Productivity losses. Car crashes. I think I once heard that some in China jump off of buildings.
And today we make the doubter's math easier by threatening the parents of free range children with prison. Face it, we are a dour bunch.