Just the nature of a plant requiring active management (and power) to prevent meltdown is a weak point. The reasonable answer to this concern imo is explaining how passive safety systems have advanced and are implemented in new reactor designs, and how plants are built so when intentionally attacked or incidentally damaged a meltdown or release of highly radioactive material does not ensue, especially for folks advocating for the widespread adoption of nuclear energy worldwide. Strikes me as odd that the typical response is instead 'but this old energy generation tech which we all agree needs to go has downsides'.