That's known as the Gambler's fallacy. Basically, "Assuming that whatever happened before will happen again (e.g. I got away with murder last time so it'll be fine for me to murder someone again now)". Just because there have been failures doesn't mean there will continue to be failures. Consider the industry evaluates each of these issues and knows how to prevent against them in the interim. Not to mention ongoing science to improve the efficiency and stability of these systems.