How are lotteries inherently unjust? A bad idea maybe, but I see no reason that people shouldn't be allowed to gamble on a die roll or whatever...
It’s the opposite effect of insurance, where society works to undo the results of bad luck.
My point being, yes insurance obviously decreases risk for owners, but since insurance companies are the ones inheriting that financial risk, they also inherit the incentive to ensure that things are being done the right way.