Perhaps this is not a popular view, but this "blameless" culture is fine and good when it's a random service going down for 15 minutes and you're trying to collaborate and prevent it from happening again.
There must be limits though. If you're handling that amount of money in a bank and you fuck it up like this, your ass is on the line, together with the ones who incentivized you to move fast and break things. This should be no different.