Ethics in action
The hackers provide some benefical information when they are looking and doing studys on some subjects such as one guy working with a backtrack by offensive. He is doin a study to see what the softwares weakness and strenths are. This is a positive because he can help software corporations by letting them know how to make it harder to get into and overall improve the security of the program.
http://www.ethicalhacker.net/content/view/272/1/
http://www.offensive-security.com/penetration-testing-backtrack-online-training.php