Totally respect your point. If someone's general standard of driving is so bad that they're a risk to others then i'd agree they shouldn't be on the road. However if someone was apologetic and was in all other regards a respectful and responsible driver I think I would be inclined to go a little easy on them for the occasional time they struggle to get their car straight in a parking bay if there was no damage. It's rudeness, ignorance or denial that get by back up.