Nothing is bad, it just acts bad but it was intended for good. That’s why it is bad, because it acts in a way contradicting to its purpose of being good.
THINGS SHOULD BEHAVE
ACCORDING TO THEIR NATURE.
IT IS BAD FOR A THING TO
BEHAVE AS THOUGH IT WERE
OTHER THAN WHAT IT IS. IT IS
THEREFORE GOOD FOR A BAD
THING TO BEHAVE BADLY,
AND BAD FOR A BAD THING
TO BEHAVE GOODLY. AND THAT'S WHY IT'S GOOD FOR
EVIL TO BE EVIL, AND BAD FOR EVIL
TO BE ANYTHING OTHER THAN EVIL