Consider the below response of those who survived the Seal and Trumpet Judgements, in which approx 1/2 of those left behind were killed. In the midst of enduring trials, they still celebrate the death of the two witnesses.Whichever way you look at it, the world (Global in scope) for the most part, is unbelieving, and thus, unconcerned with spiritual things. Having endured 21 judgments of God, I too cannot envision this to be the case at the end of the tribulation period, but respect other's positions.
Revelation 11
7 Now when they have finished their testimony, the beast that comes up from the Abyss will attack them, and overpower and kill them.
8 Their bodies will lie in the public square of the great city—which is figuratively called Sodom and Egypt—where also their Lord was crucified.
9 For three and a half days some from every people, tribe, language and nation will gaze on their bodies and refuse them burial.
10The inhabitants of the earth will gloat over them and will celebrate by sending each other gifts, because these two prophets had tormented those who live on the earth.
Its human nature to relish in survival, especially after going through a severe trial. Troops returning from a long tour in combat often want to celebrate.
Those that make it through all 21 judgements, will be some of the same ones who shook their fist at God during the most severest of judgements. When the judgements finally stop, those still alive IMO will feel empowered like never before. After all, they survived such a period that killed the majority of people on earth. Im quite confident they will celebrate like never before, and try to return to life as it was. However, as we know, this wont last long before He grabs ahold of them for the Sheep and goat judgement.