Chernobyl is a good "line in the sand" to develop the safety precautions around (for example, assume Chernobyl happens, what things prevent long-lasting harm).
That’s like assuming the manager of your grocery store will kill everyone with an automatic rifle, then designing the building for easy cleanup.
We know how to build safe nuclear plants. We should do that, and also make sure there’s enough independent oversight to make sure they’re not being managed by people actively trying to melt them down.