Other commenters have made very good points. But another driver for increased rates is that there is more stuff that needs to be replaced on a newer model car that's been in an accident. As more and more safety features are added, there are more parts that need to be replaced even if they don't seem damaged. Example: if your airbag goes off the seatbelt sensors have to be replaced as well, because the seatbelt sensors are tied in with the airbag sensors.

Even simple windshield replacements are getting more costly for the insurance carrier, because these days there are more sensors that need to be recalibrated when the glass is replaced. And full glass replacements often don't have a deductible so the carrier picks up the entire cost of replacement. I would assume at some point, there will no longer be a full glass replacement coverage option that doesn't include a deductible.