Because most of the country would arrive at work/school in the dark for 3 months of the year! And all so the point at which it gets dark can move back from 3.30pm/4pm to 4.30pm/5pm in mid-winter...which makes bugger all difference to most people anyway.
This is why I think it'd be good. As far as I'm concerned it can stay dark until lunch. I'd rather have an hours extra daylight in the afternoon/evening, than the morning.
Also, why should children going to school in the dark be in issue, it's not like classrooms don't have lights (the same as offices). It also means it's safer for children after school, which is surely preferable.