The situation may not be that clear cut from our perspective (of course God does have a definite plan). Classical pre-trib rapture posits that there will be more Christians on earth after that, people who became believers through the witness of media left on earth by earlier believers. Not until THAT church is also purified and joined by the earlier saints would the promise of the parable be realized, in that view.
It is certainly a great temptation to get into wrangles over Whose Interpretation Is Right. Dispy pre-trib rapture answers more questions than it leaves open in my humble view, but I don’t want to be dogmatic about it to the detriment of other believers who clearly are believers yet don’t share my particular outlook on eschatology. I believe in the power of God to sort out what’s true and to correct those who err in a gracious and loving manner. (It’s an abomination when the differing camps start to get so worldly and fleshly about it that they tell one another that they are going to hell.)
I certainly don’t recall telling anyone to go to hell, nor would I, but the detriment to believing believers will escape the tribulation is that people will not be prepared and will be at the MERCY of the enemy to survive.
We must strengthen ourselves and prepare for what’s coming, as we will not escape it.