The Coming of the Son of Man
Here we see that when the Lord Jesus returns to the earth there will be a world wide judgment:
"Enoch, the seventh from Adam, prophesied about them: 'See, the Lord is coming with thousands upon thousands of his holy ones to judge everyone, and to convict all of them of all the ungodly acts they have committed in their ungodliness, and of all the defiant words ungodly sinners have spoken against him'" (Jude 14-15; NIV).
That prophecy is referring to the same thing found in the following passage, where the Lord Jesus is seen taking vengeance on everyone who does not know God:
"God is just: He will pay back trouble to those who trouble you and give relief to you who are troubled, and to us as well. This will happen when the Lord Jesus is revealed from heaven in blazing fire with his powerful angels. He will punish those who do not know God and do not obey the gospel of our Lord Jesus" (2 Thess.1:6-8; NIV).
The Great Flood
Paul uses the example of the great flood to illustrate the fact that when the Lord Jesus returns to the earth it will be a worldwide judgment:
"But as the days of Noah were, so shall also the coming of the Son of man be. For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark, And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be" (Mt.24:37-39).
All Nations Will Be Judged
Indeed, we can see that those from "all nations" will be judged when the Lord Jesus returns to the earth:
"When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory: And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats: And he shall set the sheep on his right hand, but the goats on the left... Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels" (Mt.25:31-33, 41).
Now let us look at the following verse and then see Gary DeMar's interpretation of it:
"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" (Mt.24:30).
Gary DeMar writes: "The 'coming' of 'the Son of Man' is most often taught as a worldwide event since Jesus states that 'all the tribes of the earth will mourn' (Matt.24:30). Again, most Bible translations do not capture the true meaning of the Greek. A better translation is 'tribes of the land,' indicating that the event is restricted to Israel since Israel is the topic of discussion" [emphasis mine] (DeMar, Last Days Madness, 166).
It is clear that the coming of the Lord Jesus mentioned at Matthew 24:30 is a world wide event and that fact alone sinks the ship of the teaching called preterism. In A.D. 70 there was no world wide judgment so a person must throw reason to the wind in order to think that the coming of the Lord Jesus mentioned in the 24th chapter of Matthew was fulfilled in A.D. 70!