Note that what the author did could have been done in a purely passive way, just by capturing packages and seeing the DHCP responses others got. I don't think that qualifies as "hacking".
The ignorant masses demonize what they don't understand. If you don't appreciate the subtleties of passive investigation vs. offensive intrusion, then why are you even here?
Define a hacker tool - is the whole computer a hacker tool because it could be used by a hacker? How do we define tools that can be used both legitimately and illegitimately. The tools used were common network diagnostics tools.