spring trash roundup

I have to believe there is a motherless horde of inveterate litterers cruising past house Monzeglio every day.  How else to explain the volume of plastic bottles, food wrappers, bags of garbage etc. deposited along the side of the road.  I never see anyone do it during daylight hours, so possibly it is vampire litterbugs.  Certainly they have no mothers, since anyone properly brought up would never inflict their trash on their neighbors!