How did evil get into the world?

Answer 1

Once sentience is achieved human kind has always sought after more than their meager existence allowed, greed for material wealth and by extension power. Evil is in this world because some men forsake their humanity and become monsters, all for the sake of wealth and power. There are also lesser evils, like murderers and thieves, these people often have mental illnesses, were abused as a child or had some sort of traumatic experience, either that or they were simply born in an environment that promotes evil. Evil births evil, as does good births good.