TBH if someone discovers how to easily make garage WMDs we're fucked either way. That shit will leak and it will go into mass production by states and individuals. Especially in countries with tight gun control, (organized) crime will get a massive overnight buff.

Likely it'll leak or be rediscovered eventually. But not every trade secret gets leaked. Most responsibly disclosed software vulnerabilities aren't exploited (to our knowledge) before a fix is released. If the discovery isn't obvious, you have decent odds of keeping it secret for a while.

My point was just that nukes are a bad example of information that needs to be restricted to prevent harm.