I don't think the subject according to scripture is so black and white, otherwise God's word given thru the prophets of the end times and Jesus' in the New would be considered 'pessimistic' according to this author. The prophets were wrong when they said 'Peace' Peace' when there was no peace. Jesus spoke of dire times coming on the earth in Matthew 24 and Revelations. We need to continue to share the gospel, but we also need to be watchful. "While people are saying, “Peace and safety,” destruction will come on them suddenly, as labor pains on a pregnant woman, and they will not escape."--1 Thess 5:3