I'm a biosecurity postdoc at Stanford with a background in behavioral science and education research ~
+1 to this. arXiv could play a big role in contributing to a norm around not publishing dual use bio research. There are challenges of screening large numbers of papers, but they can be met. See here for an example from ASM. bioRxiv may or may not be screening already, but they aren't sharing information about their practices. It would be helpful if they were more vocal about the importance of not publishing dangerous information.