You can try to engineer something to be resistant to certain threats, but the human body isn't like that.
With the human body comparison, you can't do much but react to what's happening to you and try to fix it or prevent it from happening in the first place in another human body.
With software, you specifically choose almost every aspect of how it's going to work. This allows you to construct it in certain ways that make it resistant to certain threats and modify it as needed.