Extortion is more fair than voluntary contributions? Maybe on arguments from regression but it's not obvious.
> You buy security against large losses at a moderate price
Flood insurance is literally saying "I bet my house is going to be underwater" and winning the big cash price if it is.
Sure, you made an offsetting gamble when buying the house, but I don't see how you can claim a gamble is no longer a gamble when a partially offsetting gamble exists -- that's just two gambles, and indeed prudent risk management when it comes to big gambling.