You also need to be proactive about other possible failure modes. Avoiding a culture of blame may or may not help. There needs to be a strong incentive for the organization to expend the resources to do so, and a mere "oops my bad" doesn't provide that without SLAs with teeth.
The best way (in a team), to tackle mistakes, is to ensure the process in place corrects these mistakes. The only way to do that, is a post-mortem/learning from the mistake. If you blame it on some engineer who did it, that guy will eventually be replaced by some other guy, who may make the same mistake.