"Firesheep allows easy hacking over open WiFi"

I was reading the Metro Vancouver newspaper this morning when I saw this article headline:
"Firesheep allows easy hacking over open WiFi."
Basically, a software developer has created a program called firesheep which uses unsecured wireless networks to hack into other users' Facebook and Twitter accounts. He also put the program on the internet for public download. The developer says he created the program in order to educate people about the dangers of using unsecured wireless networks. I'm not sure how ethical this was of him though. It seems dangerous to make a program like this available for public download.

Here is the link to the online article:
http://www.metronews.ca/vancouver/life/article/675035--firesheep-allows-easy-hacking-over-open-wifi