People Are Assholes, A Continuing Series

Last week someone left a variety of items in my garden in the area between the sidewalk and the road (the name of this common landmass is apparently still under hot debate on the interwebs).

This is a pillow; in the picture below we have part of a car's bumper and more standard litter in the form of a water bottle, partially empty.

Is it so difficult to pick up after yourself?  Is it so difficult not to leave bedding material lying about in other people's gardens in the first place?  Naturally, one's bumper could fall off anywhere, but pillows would seem to be easier to contain.