Why do drivers make things so difficult?

In some parking lots there are lined-off areas between the handicap spaces to allow the disbled to unfold themselves from their vehicles and/or get their equipment in and out. I saw someone recently who had squeezed their small car in between two cars with handicapped permits, parking right on the yellow lines and blocking the doors of bothe handicapped vehicles. The lines were freshly painted, so there was no excuse. Had I seen the driver I would have spoken to him/her.