Why do people have to do what they really shouldn't be doing?

We live on a main road that runs end to end through a quite large housing estate. Normally Monday to Friday, & occasionally on a Saturday, it can have a fair bit of traffic on it but Sundays are fairly quiet.
Today it has snowed none stop for about six hours, very heavy stuff & it's settled. We have got around 6" in the garden!
The road outside also has snow lying on it, the hundreds of cars up and down, far more than a Monday morning, have not been able to clear it!
It's been that busy that there was a queue about 100 yards long waiting to get out at the roundabout at the end of the road at one stage!!
What can't they understand about "stay at home"!
