If you are prone to despairing at the Evil in the world, it might help you to know about Aristotle's theory of eudaimonia. I.e. that all humans pursue happiness and excellence, and that this is prompted by their innate urge to work toward the Good.
All humans inherently desire the Good (that is the fundament of Natural Law) and are derailed in their pursuit of it by inaction (hesitancy, fear, or reluctance), or lack of virtue (virtue being good habits, of mind and body). When humans "miss the mark" (sin), it is due to their misunderstanding what the Good actually is, or falling short of effort, rather than any true urge to pursue Evil.
As Christians, we have the best earthly example of the Good, so our yoke is very light. The more virtuous we become (through our works), the less often we shall miss the mark, and the less often we will fail to act. This creates a sort of virtuous cycle, that propels us closer and closer to the Good, until we die and become part of the Good.
People who are unwittingly working toward Evil, are therefore to be pitied, as they are aiming at the wrong mark , and can hopefully be redirected away from their error by our wiser counsel or examples. Further, preventing them from particularly egregious misses, such as murder or rape, is our duty to them out of Love, in fact.
That is why Jesus, while dying on the cross said,
Father, forgive them, for they do not know what they are doing.