Most people are uncertain or in denial of an eternity after we pass away from this world. I believe anything that can "jar" a person out of his or her comfort zone, is always an appropriate move.
The certainly of judgment is indeed a matter to be reckoned with by the sinner; the sinner must be attracted to a crucified Saviour. Repentance is the key to saving faith.
People should be more concerned about where they are going for eternity rather than if they're going to suffer and die a physical death in the tribulation. The tribulation will come and go, but eternity will be forever and permanent.
If anything, I think the end times should be an illustration of where the world is headed, drawing upon the many things we see wrong with it nowadays, and making the connections to show why not following God is destructive to both ourselves and His creation.
If a person doesn't know the Gospel of the Kingdom, the Gospel of peace, The Gospel of our Salvation, The Gospel of God, The Gospel of Christ, then I guess The Gospel of Fear is the most likely alternative.
Paul said this.
1Co. 2:2
For I determined not to know any thing among you, save Jesus Christ, and him crucified.