- blocking a sightline that pedestrians need to safely cross the road
- blocking a dropped curb that wheelchair/pram users need in order to mount and dismount the curb
- parking on the pavement so that wheelchair/pram users can't fit between the car and the wall, forcing them to go around on the street and putting them at greater risk
- damaging/cracking the surface because it is designed for foot traffic, not heavy vehicle loads
- intruding into a bus lane or bus stop, thereby causing delay for public transport passengers
If you only ever drive places, you tend not to think about the consequences of bad parking, because you don't suffer them yourself. But I don't drive, so I notice this antisocial ruining of the public commons all the time. Motorists are not good judges of which rules "really matter".
Isn't there also usually a good reason why the penalty is a small fine?