The problem with Chernobyl was that (1) it didn't have a containment dome, and (2) it was designed so as the temperature increased, the reaction sped up. It was fundamentally unstable.

Neither of these problems is true of more recent reactors.

We don't make bridges safe by getting humans to cooperate better and cross bridges one car at a time. We make them strong and stable so humans can drive however they like and the bridge is fine. That's how all engineering works, and it applies to nuclear reactors just like anything else.