I've never had anything to do with guns and I admit I find it weird to want to bring one to a rust conference, ridiculous actually. I do see the point though that whoever came up with these rules is intentionally provoking people. Why would a software project have firearms policy other than as a sort of discrimination or put differently a way of showing the kind of people who are welcome and those who are not. Laws are what they are, and if someone is complying with the law completely unrelated to the software, I don't think my software should have an opinion about that. It's a loud dog whistle and a provocation, not a useful policy.