Maybe BTC should hard fork to recover the lost Bitfinex funds? I think this illustrates the concerns a lot of people had with the ETH hard fork. These kind of things will continue to happen and only get worse as cryptos get mainstream adoption - they will become an ever bigger target for theft.
You can't have a hard fork every time people lose money. It sucks but sometimes criminals will get away with it and there is little you can do. Same as regular life.
I think some people will sue Bitfinex but I'm not sure if they will succeed. I'm sure they (BF) probably have some clauses to protect themselves in the terms and conditions.