it is inconsiderate to do a poor parking job
Bill drives to a meeting and sees two parking spaces near where he's going.
Bill wants to park his car.
Bill parks his car taking care to use only one parking space.
Bill parks his car quickly and carelessly taking up both spaces with his car.
The next person who wants to park in that area is able to fit into the spot next to Bill's car.
The next person that wants to park in that area isn't able to because Bill took all the parking spots.