As far as I understand the proposed questions, the legal parts (learning, pentesting, etc.) are all on topic on security.stackexchange.com. For the clearly illegal parts of breaking into systems without permission (e. g. "How do I hack into Bank Of America computers?"), well, do we want them on stackexchange at all?
Agree 100% - the "White Hat" security aspects of this proposal are entirely covered by security Stack Exchange, along with some of the "Black Hat" stuff if it has application in defence of networks etc.
The out and out "Black Hat" stuff doesn't belong on any Stack Exchange site.
I would think "hacking" means much more than just breaking into security. It means being able to hack apart a system and understand what's not in a manual, to be able to reach it's insides and change it. Much beyond the common, War Games or Swordfish buzzwords of "Black Hat" vs "White Hat".
I see only one "Hat" when I think of a hacker: "Red Hat".