The belief that we are in the end times is eminently more credible than the preterist fantasy of yours that the sign of the Son of man appeared in the heavens over Jerusalem in 70 AD??? LOL
Based on what?? Some warped view of prophecy invented by some folks 150 years ago that has been discredited for its prognostications over the decades?
God does have a sense of humor. To have secular Israel raised up in 1948 really set off the end times date setters. And now we all are just sitting back watching them twist in the breeze. 1948 1967 1988 2007 2012 ??? Every time one date passes another gets invented. And another book written. And another prophecy conference called. And the beat goes on.
sign of the Son of man appeared
As I said, if you wish to actually do some hard work and exegete Scripture and show us conclusively how "the sign of the son of man" must mean the second coming, please do so. Otherwise recall you are the one sitting with the naked emperor.