Rule #8: Over time people afflicted with lycanthropy will become evil.
This rule was conceived in order to put balance back into the universe. The werewolf has become kind of good-natured, at least in some movies, books, and comics. You know what I mean; the werewolf as a hero, a Byronic Hero, even. Sometimes the werewolf uses its powers for good in order to protect someone from harm, or help a lousy high school basketball team win. Uhg,
Enough already! These supernatural creatures have been feared by humans through the ages. People do not and have not feared them for no reason. There is a reason, of course. Werewolves are evil and humans are their prey. So I promise to keep my werewolves evil.
However I do admit in the early years as someone is grappling with lycanthropy they do not necessarily become evil from day one. The change to evil often happens over time. And the road can be bumpy. The lycanthrope will definitely have hard decisions to make as he/she accepts what their true nature is. Ultimately, the werewolf needs to feed on humans.
That's evil, right?