Can anyone tell us why the Temple was destroyed in 70 AD?
It's right in Daniel 9 as a prophecy and then in the NT it is confirmed by Jesus Himself. The 70 weels of desolation was put upon Israel because they did not know the time of His coming. They were not watching for Him.
Luke 19:43-44
43 Before long your enemies will build ramparts against your walls and encircle you and close in on you from every side.
44 They will crush you into the ground, and your children with you. Your enemies will not leave a single stone in place, because you did not recognize it when God visited you.[
a]”.../NLT
And I think there is an implied warning to us in there about the (pretrib) Rapture. If you're watching for Him and expecting Him...then you don't have to go through the tribulation.
If you wasn't watching for Him? Welcome to the Tribulation friend.