The contest is not between Us and Them, but between Good and Evil, and if those who would fight Evil adopt the ways of Evil, Evil wins.
— Thomas Jefferson
It may be necessary temporarily to accept a lesser evil, but one must never label a necessary evil as good.
— Margaret Mead
Unless we lay our course in accordance with this principle, the great power for good in the world with which we have been intrusted by a Divine Providence will be turned to a power for evil.
— Calvin Coolidge
Sometimes (at least in principle) God might allow some evil because doing so will prevent a greater evil, and sometimes He might allow evil because it will produce a greater good.