I'm not trying to justify insurance company profits. I think it's mostly a load of crap. But the costs of a grocery store are pretty much fixed and easy to predict. The costs for an insurance company are far more complex, because they change with the number and scope of claims.

I don't think you can deny there are cost risks for insurance companies that a lot of other markets don't have. However, to back you up a bit, their profits are extremely good which probably means they are largely overstating the risk in order to gouge their customers.