Let us look at this verse:
"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).
Well known preterist author 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).
Of course that is wrong because when the Lord Jesus returns all men from the nations will be judged:
"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).
We can see in the following passage that people from all the nations will be judged when the Lord Jesus returns:
"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).
Since nothing like this happened in 70AD then it is obvious to anyone who will use their brain that the Lord Jesus did not return in 70AD when Jerusalem was destroyed!
But the preterists are blind to the truths revealed in the Bible! The only thing they are good at is perverting the truth found in the Scriptures!