Most hackers do it to expose secrets that various government groups are trying to keep secret, exposing conspiracies and the like.
After everything that has happened from Sony and the various other companies that got hacked, I doubt it is acceptable.
Absolutely not. If you're not stepping up and saying "hey guys, you're vulnerable here, here, here, here and here," then you're not helping. bringing down a network and jeopardizing user information isn't helping anyone at all.
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