Do good people think evil?
Of course . ‘Evil' , in some definitions , differs than in others . For instance , one common definition is that evil includes anything immoral ... yet slavery was at one time within the bounds of morality , as was various degrees of abuse towards women . In modern days , it is often accepted among otherwise good people to persecute gays or other religious groups like muslims . So the definitions of ‘evil' can change , as can the definitions of ‘good' . Both are dependent on our perceptions , so quite possibly have nothing to do with universal Truth .. but rather with individual or collective ‘Reality' ... ( meaning our accepted versions of Truth ) .
Religions in particular work on a principle of some evils being necessary to achieve good ,, such as evil in the world in order to exhibit the love and mercy of God . ( you can't measure the greatness of good without compareing it to a ‘bad' ) . And since those who follow a religion define Good and Bad in religious terms it only needs convinceing them of how God defines those terms ... ( such as when the pope at the time convinced his followers that the commandment "Thou shalt not kill" ment ‘except pagans and nonbelievers and muslims and jews' , thusly ordaining the seven crusades .. various inquisitions .. witch burnings ... and holy wars . Those commiting those unspeakable acts of evil were very much seen as good people within their communities and religion .. So indeed good people Can think , and do , evil .