Genesis 6:5 The Lord saw that the wickedness of man was great in the earth, and that every intention of the thoughts of his heart was only evil continually.
Jesus said that His coming would happen, just as in the days of Noah.
I’m not so sure people would notice other people missing. Considering the devilish stronghold on the media and social media networks they could easily brush it off or as a favorable happening for the rest of the world.