I have sympathy, I just don't agree with the OP that it is an inherently flawed and unfair system.

I made the mistake once of not getting a ticket in the Perry Vale car park when I was picking up a parcel from the sorting office. When I came out, the parking warden was there and about to write me a ticket. I showed him my parcel and said I didn't realise about the ticket. When he explained why I still needed a ticket, it made perfect sense and I felt rather foolish. I'm happy to say he let me off that time, so they are not all mean. I've never done it again.

I once got a parking ticket because I put the ticket from the payment machine upside down on the dash and the warden couldn't read it.

I've never done that again, either.