Then it would stand to reason that they would be happy and overjoyed to see Jesus show up. But according to scripture...that's not what happens.
"At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. (Matthew 24:30)
Behold, He is coming with the clouds, and every eye will see Him, even those who pierced Him; and all the tribes of the earth shall gaze upon Him and beat their breasts and mourn and lament over Him. Even so [must it be]. Amen (so be it) (Revelation 1:7)
Why are people not joyous to find their "salvation" has arrived? It says ALL tribes shall mourn. Why would people not be happy about this return that they have counted on to solve all the world's problems?