Now, I wouldn’t be so much of a stickler on this if the pretrib rapture folks would just say “we think the rapture might happen before the tribulation, because we make the following deductions...”. Yet, you don’t often hear them say things like that. Most of the time, their statements are much more final and certain, as if their interpretation is based only on Scripture, and not on their own fallible interpretations of it.
It's more than that.
For many I've seen, dispensational distinctives are what scripture says, without any interpretive step acknowledged.
True, I’ve seen a few statements like that on this very thread.