That itself is not a strong argument against nuclear power - because the exact same thing happens in every industry. If you look around carefully - at your workplace, at the shop you buy your food in, at the construction workers building that block nearby - you'll find staggering amount of fraud and incompetence almost everywhere. It actually makes one wonder how our increasingly complex world still somewhat works.

So keeping in mind that incompetence and fraud are commonplace and not something industry-specific, you have to consider what the numbers tell you about the safety of each option, and those numbers turn out to favour nuclear energy. Keep in mind that those statistics implicitly take into account all that incompetence and fraud you're worried about.