This type of excuse is disingenuous. Drivers who annexe footways for themselves offer this as if they're performing some sort of civic duty, of benefit to the community. It's bollocks. They are disguising their personal convenience as concern for public safety.
Park legally and you won't block traffic or pedestrians.
Not always true
A road near where my wife grew up is a main road through an estate
if a car - or a string of cars - is parked by the side of the road then cars can only pass one at a time
hence the road becomes pretty much one way at a time
and it is a main bus route
OK - the council could widen the road by narrowing the pavement (there is enough room) but that would take a while
It is the same here - but not quite as bad - but to allow for cars to be parked on the road would require work from the council
So - enforcing it is practical - but ideally there should be warning and funding to allow for road widening where needed on bus routes etc.
Oh - and while they are at it they could chuck a few cycle lanes in maybe??
A lot of the problems are on estates where they were built in a certain time span where the planners didn't think 'poorer' people would ever need a car - hence no allowance for driveways. Where I grew up you can see the difference in planning ideas based on the expected 'type of people' that would live there and the time the places was planned.