I truly get a headache when reading the pretribbers' attempts at describing their incredibly convoluted doctrine. It makes my head spin. Is the truth really that complicated? You have people believing in 5 raptures, 3 comings of Christ and other nonsense that is not mentioned anywhere in scripture. How can anyone make any sense of all that? Doesn't God want us to know the truth about these things? Did He purposely make it all into a 10,000 piece puzzle that we need to put together?
The truth is relatively simple, and I've been stating these things, to some degree since the mid-70s. 2 Thes 2 states, unequivocally, that Christ cannot come for his Church until he comes to actually destroy the Antichrist *with the breath of his mouth." That means Antichrist must be revealed 1st--Christ cannot come at just any time, any day, or at any time prior to the revelation of Antichrist and his actual destruction.
Jesus made it equally simple. Any so-called Return of Messiah *cannot be* before he comes in glory, in full revelation to the earth, in full angelic regalia. Simple enough?
But if you want to do any in-depth tracing of the belief over centuries and with reference to the original source material, you will find that the doctrine of the Coming of the Son of Man with the clouds originates in Dan 7, where the Son of Man comes from heaven with the clouds--just as Jesus said. And the context for this Coming from heaven is the establishment of the Kingdom of God on earth coupled with the complete destruction of Antichrist and Antichristianity (this is not anti-Amill or anti-Premill--it is neutral in this respect).
But no matter how simply it is put, Dispensationalists and Pretribbers double down and make things even more complex in order to create doubt, in order to further the cause of confusion and division and disagreement. As you said, they create more comings of the Son of Man. And they even bicker over the meaning of words to hopefully bring in the smallest tangential evidence that what they say might be true. In fact, none of it is true, and none of it makes biblical sense. Thank you!!
To give you a single notable example in my own personal experience. I lived for a time in Orange County CA where Hal Lindsey did his teaching at Melodyland Christian Center, where I attended. And Chuck Smith, just down the street, was continuously proclaiming his Pretrib Coming beliefs. I began to write Smith questioning his doctrine as non-biblical. He ignored me even as I enjoyed Calvary Chapel concerts and other teachings that he gave that I thought wonderful and biblical. However, when I asked if he could handle a Postribber like me attending his church he essentially said no. "Can two walk together," he said, "if they be disagreed?"
On the other hand, my own pastor, Ralph Wilkerson, of Melodyland Christian Center I asked the same question. And he fully embraced me, regardless of my Postrib views (he was Pretrib).
Some people are hard-hearted. Smith ended up in the next couple of years doing something that he later regretted. He began to tell people to sell their possessions because he predicted Jesus was coming very soon. He later admitted that he "nearly" erred by giving dates of Jesus' Return.
People need to search their hearts to see what kind of attitude they have, regardless of their belief. But they certainly need to check out if they're over-complicating basic biblical teachings in order to disbelieve them and follow a popular prophetic school.