Such will be the case at the end of the age. Jesus warned time and again not to be caught off guard by His return which would be prefaced by certains signs to warn us.
For you yourselves are fully aware that the day of the Lord will come like a thief in the night. While people are saying, “There is peace and security,” then sudden destruction will come upon them as labor pains come upon a pregnant woman, and they will not escape. But you are not in darkness, brothers, for that day to surprise you like a thief. (1 Thess 5:2-4, ESV)
Despite the warning signs though, most will "play through" even as the horizon is darkened by impending judgment.
For as were the days of Noah, so will be the coming of the Son of Man. For as in those days before the flood they were eating and drinking, marrying and giving in marriage, until the day when Noah entered the ark, and they were unaware until the flood came and swept them all away, so will be the coming of the Son of Man. (Matt 24:37-39, ESV)