Some who proclaim gloom and doom tend to equate all disasters with the judgment of God. For sure, America deserves judgment. But to equate every natural calamity with God's punishment belies the important part such happenings play in balancing the creation. For example, powerful hurricanes that wreak such destruction in some areas also suck up tons of moisture and drop it as life-giving rain in other areas. Such people sit on their hands, so to speak, assuring an even worse world for their children if the end doesn't come soon.
People make lifetime decisions based on end-time scenarios.
I have talked to people facing old age without children, mates, or resources because in their youth they believed the end was imminent. Others have rushed into ill-advised marriages because they thought time was short. All these have failed in the past. Those who espouse them are an embarrassment to Christians. A number of Bible passages are commonly believed to show that by observing the signs of the times, Christians can know when the end is near.