Very ill-informed opionion (though I recognize it is your opinion). Insurance on your home is simply a transfer of risk. Let's walk through this;
Most companies that have a large book of homeowners insurance are running a combined ratio of more than 100% That means for every $100 that comes in the front door in premiums, more than $100 goes back out in claim payments and loss adjusting expenses. If that is thievery, they are some very stupid thieves.
... which then suggests
1. those numbers are actually false (as no insurance company would do business at anything less than a profitable rate); or
2. that the miniscule payouts on homeowners' claims are more than absorbed by their premiums collected on Flood/Fire/Disaster, etc. insurance, which remains considerably lucrative.
I would go one step further to suggest that the ones who are typically paying the 100% or 100%+ ratios are those who only offer these "unprofitable" policies to customers of their rather profitable policies.
Also, your model makes quite a few unqualified assumptions. The first and most obvious is that there will in fact be the loss-triggering event that makes the premium worthwhile in the first place. This is pure risk assessment/speculation, or as I like to call it, "legalized gambling" (for those who reside in non-gaming states). We all concede this assumption and are/are not willing to play based on the likelihood of the risk and the magnitude of the loss.
The second, more important assumption is the payment of the policy itself. Your model assumes that the insurance company will honor its commitment. The expectation is that the "gray" is the uncertainty of the disaster, the black is that I absolutely pay my premiums on time, and the white is the insurance company absolutely covers the disaster as advertised. The reality is that the black is you pay, and everything else is gray. If the insurance company can call the damage to your hurricane-damaged home "uncovered flood damage," they will. If too many people suffer the same effects, they may not be willing/able to cover the losses in your area. Delays, legal battles, settlements, compromises, and more uncertainty all cloud the insurance industry's commitments.
I am not the ideal guy to lock horns on the subject because frankly, many more know the ins and outs better than I. I am sure that those proponents of insurance are probably in a better place having it than not, and I have no blanket that covers all companies/policies with respect to glorification or villification. I simply wish to point out that the insurance issue is far hazier (in general) than its proponents tend to color it, though it may be far more valuable to many with it (haziness and all) than without it.
My knee-jerk side would outlaw it within hours of my despotism fantasy however, because necessary evil or not, I think it's become a cancer of society.