If the council allow something, they should make sure it can be done safely (just as they have assessed the current situation and deemed the path wide enough to allow parking safely).
Like with footpaths - if there is a hole in a path, the council pays for it to be filled, as otherwise it could be a danger to pedestrians. What, filling a hole, just for the benefit of the pedestrians?? How dare they?
I think they tend to mend holes because they don't want people to hurt themselves. The difference here is that it's more difficult to isolate the impact that driving up a curb every day has. But that doesn't mean it doesn't have an impact.
Am I right in assuming you don't have a car BigJulie?