It's a common instinct to shrink from the unpleasant, just hoping it will go away. Like sea anemones retreating into themselves when they detect a threat, human beings sometimes simply withdraw from things that are not nice and that threaten their comfort and security.
Although, fundamentally, Christian Science claims and proves the inclusive omnipresence of God, good, it doesn't leave unfaced or unchallenged the claim of the not good. The Science of Love doesn't brush aside the appearances of evil but helps mankind confront and break the delusions causing its sufferings. This Science is not a cozy human-mind psychology allowing us to ignore what's bad; nor is it a vaporous mysticism concealing evil. Its students aren't superficially believing they "live in a world where everything's good, and what isn't is unreal." To think of Science as just a protective cocoon would be worse than simplistic. It would make a grotesque parody of Science.
Referring to Mary Baker Eddy's views on this theme, one of her household recalled: "Someone sent her a set of the three little brass monkeys—'See no evil, hear no evil, speak no evil.' That, said Mrs. Eddy in substance, is not Christian Science, it is heathen philosophy. Christian Scientists do not close their eyes to evil, but open them. They open their eyes, spiritual discernment, and awaken to the true nature of evil or sin, to its false claims, methods, subtlety, etc., and then realize its nothingness, its utter powerlessness to control or to harm." We Knew Mary Baker Eddy (Boston: The Christian Science Publishing Society, 1979), p. 117 .