I think it is reasonable that they spread the loss among each miner, this is a system risk that everyone is facing when mining on pools
That is completely backwards. Miners should NOT take a hit when the pool loses money due to their own mistakes. ANY responsible pool owner should be absorbing whatever loss they take. The only time the reverse should even be an option is if the pool is forced to shutdown entirely. If the pool remains online, miners shouldn't see a single bitcent removed from their real balances. Too bad in this case the majority of miners won't have a clue what their real balance should be since the problem still hasn't been resolved.