[marcosdumay]

If you can't fail safely, you better review your entire architecture.

Software fails, you can make failures rarer, but you can't make they go away. You have to deal with it, it's not an option.

[vardump]

It's all really about risk management. Things can (and will) go wrong, and it doesn't only apply to software.

This involves a lot of thinking and collecting information about potential risks and evaluating their probability and severity.

Then you just mitigate the worst risks, probability times severity (other factors are also possible). Some residual risk always remains.