We must come to see our reality as it really is, including the existence of evil, wickedness and cruelty.
We can and must persecute them down to their most primary sources.
It is possible, through an extended and concentrated effort, to eradicate them.
Surely, we must all know that in this world, there are some things that we, as decent human beings, must fight and annihilate.
–Rabbi Adin Steinsaltz
From an essay, "Evil Must Be Fought" by Rabbi Adin Steinsaltz