If everyone has access to the same offensive tools, everyone is able to run their own pentests and patch themselves before the bad guys get to them.

It’s like a vaccine where you get to try a medication based on the original pathogen by performing a dry-run on a backup of yourself already in a hospital ward.

Open models aren’t like firearms. If everyone has a gun the mall parking lot is a much more dangerous place because the consequences of using a firearm are so dire, even if you’re in the right.