LOL, no it's obviously more ignorant to claim the hackers will know about it anyway so you might as well tell them. It's the same argument we hear from those that want us to share all our nuclear secrets with China and Russia. "Why not, they'll get them anyway by stealing, might as well just go ahead and give em to them." Wait, you say the same thing about open source software, don't you.
The argument that when we make something illegal criminals wont have it is the same argument gun grabbers use.
Another failed analogy of yours, with you talking in circles now. Guns are a completely usable finished product, used legally for many authorized purposes. Vulnerabilities aren't guns, they're like a blueprint for making a gun. The only equivalent to guns in this discussion are exploits, but you just said above that there were no good uses of exploits, remember, so why would anyone but criminals have a need for them.
Guns, like information, can be used for both legal and illegal purposes, both attack and defense. You attempt to ignore the percent of people who use the illegally to break an apt analogy is pretty transparent. An IT administrator can use that information to protect against the attack of someone else who has it, leaving IT administrators without information is like leaving them unarmed..