When the banks get bankrupt (i.e due overleverage, stealing/using customer's money etc) their customers get nothing back. A such example is
MF Global. I'm not going into the whole story why banks and centralised/opaque finance is bad.
Now the whole point of crypto was the tech behind it which was supposed to replace banks, exchanges and missuse of your OWN money. It's supposed to be an alternative to the trash financial tools we already use. The fact that people are using entities such FTX, Binance makes them deserve to be punished for their betrayal. Regardless if they use FTX or JP Morgan they pretty much deserve to experiment the shortfalls of centralised finance. I think it's part of the hello world example of what DeFi is trying to solve.
One more thing: If FTX was hacked I bet it has almost nothing to do with the crypto technology.