I recently stumbled upon some questions blatantly asking for help in cracking wireless security passwords (Have a look at the tag aircrack-ng). Should those be flagged as "unwanted in our community"?
This question is similar, but I am asking specifically about hacking into a wireless network. The only legitimate reason I can imagine is hacking into your own just for fun :). I doubt that is what most people are interested in.
If I teach someone how to pick a lock, it's his decision if he wants to become a burglar or a locksmith.
If a question is like "Hey, how do I crack my neighbors WiFi?" then those are horrible questions and will be closed anyway.
If the question is scientific and someone has done some actual research about a given security aspect, then, by all means, it's welcome.
If someone has an issue with a well known "security auditing" application, then that is welcome as well. The importance is to solve the problem at hand. We're not just solving problems for single users here, we're solving issues for many possible people who might have the same issue.
Maybe that one person had bad things in mind, but maybe 10 others with the same problem have a legitimate reason.
This is my personal opinion.
There are actual, legitimate reasons to do something like this:
This site aims to facilitate learning and understanding. Some knowledge can be used to harm others. The same knowledge however, can be used to protect.
That being said, if the users are actually stupid enough to mention their neighbors' Wi-Fi, by all means, flag it, vote to close it, or better yet, edit it so it's about the technology, not about their motivation. If the answers they get don't fit their actual problem, tough.
Most network hacking questions will probably be more on-topic at IT Security. There have been several Meta discussions as to how on-topic "black-hat" type stuff should be. Here's one of the most recent:
https://security.meta.stackexchange.com/questions/897/clarify-our-stance-on-black-hat-questions
There's a new Q&A site in Area51 called Computer Security Hacking that might be a more appropriate place for these questions if it gains traction.
