Have to say, while I sympathise with RRSDOL, 400bhp seems on the money. It may not seem 'fair', but insurance doesn't run on fair, just likely.
Many years ago I got rear-ended. In fairness, and in law, that was down to the guy who rear-ended me. It's up to him to not drive into people, period. But if I'm honest, if I hadn't let my mind wander a bit, to the extent that I suddenly found myself having to slam on the anchors because the guy in front of me had stopped suddenly, the guy behind would have had more warning, and might well not have hit me. Nowadays, I think, I'm a more attentive driver...I would have seen what was up ahead, and dabbed the brakes a couple of times, to signal to the guy behind 'we may be stopping soon'. That doesn't make it any less his fault, ultimately. But it does - if you're looking at 'averaging charts', make me more of a risk.
The parking one is even more glaring. 'How can they penalise me? I wasn't even in the damn car when it was hit!' Well, maybe it had something to do with where/how you parked. Maybe someone else would have looked at that space and thought 'probably better not'. Maybe not. Maybe your choice was impeccable, your parking too. Which means you're a victim of other drivers, who lack your care and foresight. But you are, fair or not, in the pool of 'people whose cars got hit while parked'. And that makes you a higher risk. It may not be 'fair', but it's the way the industry works. And as 400bhp says, it's hard to see how it could work any other way, apart from having every single claim investigated for 'fairness', which would be immensely costly.
The *real* scam of the industry is the way it relies so massively on inertia. I can't think of any other entire business that's explicitly built on the principle of screwing existing customers to finance getting new ones. But that's a different issue.