In an effort to make things appear better we do not see things as they really are.
Do not let us mistake necessary evils for good CS Lewis
It is a mistake always to contemplate the good and ignore the evil, because by making people neglectful it lets in disaster. There is a dangerous optimism of ignorance and indifference. Helen Keller
We may draw good out of evil; we must not do evil, that good may come. Maria Weston Chapman