You mean, if Anthropic made all of their models open-weights from now on? I'm pretty sure Dario thinks this will be extremely unsafe, because it'd provide unrestricted access to all the most capable/dangerous models to everyone, and hence doesn't do it. Why do you think it'd make the world more secure, if he did?
AI technology is now only audited by people who think like them. The ones that dont either dont join the company, or leave after a short stint as we have seen. That creates an information or feedback bubble which is not healthy nor productive.