The people who planned the Fukushima plant made some stupid mistakes. That proves that we shouldn't make stupid mistakes. But that's not possible. Yes, we can

The people who planned the Fukushima plant made some stupid mistakes. That proves that we shouldn't make stupid mistakes. But that's not possible. Yes, we can mostly avoid past mistakes. Until there is no accident for a while, people become complacent and start cutting costs. We cannot avoid the mistakes we have neither made yet nor thought of.