Hacking "hacking tools"

Defcon: Poking holes in hacking tools, article at news.com.com security blog states that The Shmoo Group has found loopholes and bugs worth exploitation even in hacking tools such as Metasploit, Kismet etc.

Since long I too have been thinking of the same. That if bugs exist in all softwares then why not in tools such as network scanners and hacking tools. And this read just made me happy.