Pure Evil is an oxymoron.
Evil is impure thinking or a fear that is caused by a false belief that causes destructive actions based on a negative perspective of whatever is occurring.
A negative perspective is a judgment that condemns something or someone as bad or wrong relative to their personal beliefs about reality.
Whatever is perceived to be intensely bad or extremely wrong is said to be Evil.
It is a work of evil that is d’evil work.
Pure evil is a metaphor for intense evil.
Evil only happens to people who perceive life as happening to them.
Nobody ever considers the actions that are taken by them to be evil, from their perspective.
The mass killing of people & destruction of property is considered to be pure acts of evil, unless that is, they are carried out by an army authorised to do so by a nation state.
An opposing army may be seen as pure evil where as a defending army may be seen as brave & courageous with the purity of goodness.
The more pure a good intention is seen to be, the more pure evil it tends to attract!