Many prophecies dealing with the last days have yet to be fulfilled.
I wouldn't call anything God does as 'random' and there is a day of judgment coming for all that is predetermined of God.
Lots of information on what will happen as far as the calamity upon mankind in the last days is found in Isaiah, Ezekiel, Daniel, Matt. 24,25 and Revelation and in many of the other prophets.
Much is said in the scriptures about the second advent of the LORD Jesus.
Matthew 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
Matthew 24:37 But as the days of Noe [were], so shall also the coming of the Son of man be.
Matthew 24:39 And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.
Matthew 26:64 Jesus saith unto him, Thou hast said: nevertheless I say unto you, Hereafter shall ye see the Son of man sitting on the right hand of power, and coming in the clouds of heaven.
Read Zech. 14 just for interest sake and get a view of the Kingdom on earth when Christ returns.
It is not a good picture for the UNSAVED in that day and no Christian wishes this event on anyone.
1 Thess 5:3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
Notice events will build up in the final days and culiminate with some of the worst outpourings of God upon sinning man.
What is really sad is that those on the earth know the cause of this day and who's wrath has come upon them and yet they will not repent.
Revelation 6:16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: