I was tempted once to park close to the driver's door of a car that wasn't parked between the lines in the parking lot of my dentist. I didn't, but made some comment about the parking when I was in the office, and a woman in her late 70's indicated that it was her car. At that point I was thankful that I didn't make it more difficult for her to get into her car and leave.
Sometimes there are better reasons than that the driver is a jerk for why someone can't seem to center their vehicle properly. If it's an old Buick or Mercury, the driver might have done the best they could. If it's a jacked up 4x4 or lowered Integra with special bodywork, they probably deserve having a hard time getting into their vehicle.