I believe that it's because that would mean many more people would be driving in darkness in the winter, leading to accidents (groggy drivers are bad drivers, and in fact the day after DST starts has a significant accident increase), children waiting at bus stops in the dark, etc.

I find it nearly impossible to stay in bed after the sun has risen. I have to get to bed earlier in the summer, because the sun will get me up earlier. So it's a real issue for some.