We already do... mostly. The only thing I've seen linger are questions concerning "legitimate" hacking (like a user who forgot the password on their home computer or similar). Even those tend to get a response similar to "there's plenty of sites out there with directions on breaking into Windows, we don't need it here too".
If it's suspiciously or obviously against company policy, I do my best to shut them down immediately. The others I'm still against as it's rare for a SA who follows best practices to have to engage in any questionable behaviors.
On the topic of exploit analysis (white hat), that's a security professional's field, and the reason IT SecurityIT Security has it's own site.