Even if the "new reactor types cannot possibly do harm" was true, that's exactly what you told us the last few decades. Every reactor was safe. It was physically impossible that all those safety systems could be overridden, defective, whatever. Impossible.

And every time we saw that it's not true.

After several decades of this we don't trust you anymore. As no sane person would.

You might even be objectively right. But your safety arguments werde wrong the first two hundred times. Why listen to your explanation of your two hundred and first attempt? Let's try something else where experience doesn't virtually guarantee us that we'll be burnt.