“There is no way to peace, peace is the way.” ~ A.J. Muste
It’s best to appeal to a person’s better nature. Even those who we think are “evil”, have a better side to them.
If you treat people like you’re in competition with them, they’ll compete with you. If you treat them like a friend, they’ll be friendly.
This is generally true, but not absolute. Few things are absolute when discussing how humans will behave.
But no one is born evil. Everyone is born with a capacity for good and for evil. Evil happens when we forget we are good.