Good will always prevail, but there is no limit to the amount of suffering that will be required for that victory to occur. If men stand up early on, the suffering will be minimized because it will be spread over many people. The worst that might happen is that some folks go to bed scared for a while, but widespread bravery will allow good to prevail without much suffering. If, however, there is a decided lack of courage displayed by a large group or society early on in an advance by the powers of evil, that aggregated courage requirement will be borne by a relative few at a later time. The longer this goes on, the worse it will be for the few who have to bear the weight of the cowardice of the broad society.
We're in for some pain, folks.