But that angle seems to have been covered already so just to be different - insurers also have the strongest incentives in the market to make sure risks don't play out. There is nobody with more at stake in the event of a bad flood or other disaster. The incentive structures around insurance (in a free market, though) are actually really healthy. It is probably the strongest argument against insurance being a racket short of not-for-profits.
It is fun to imagine a big US insurance cartel acting as the counterbalance to Big (Insert Industry Here) in a city planning meeting because they are worried about the risks.