As a bike commuter, I'm pretty happy to be back on standard time. Light is much more valuable to me on my morning commute as it also makes things warmer.
The morning commute is not only adults going to work. It's also kids heading to school, many on foot or bike.
The evening commute, on the other hand, is mostly adults coming home from work. School days are significantly shorter than adult work days, so the school kids are home by around 2-4 PM, before the evening commute starts.
Thus, if you only have enough daylight for one of them, you'll benefit more people by using that light for the morning commute.
Similarly, there are more adults than children and Adults/parents commute at more dangerous busy times. "Think of the children" should only go so far.