The problem for our brothers in Christ who cleave to sola scriptura is that St. Peter's letter is contained in Scripture itself and so is binding upon them (in contrast to Holy Tradition which they reject).
Now, I understand the fundamental principle of Biblical construction pertaining to sola scriptura to be that reasonable minds may differ on all matters EXCEPT when Scripture so clearly rules on an issue that the matter is not subject to legitimate debate.
I've pointed out above what appears to me at least to be precisely such an unambiguously clear Biblical injunction AGAINST private speculation on prophecy, and have yet to receive any sort of a reply.
Indeed, I've posed this question to many Dispensationalists over the years, and have yet to receive an adequate reply. Mostly just hemming and hawing.
This is a fundamental threshold issue. The Bible tells us flatly that BEFORE we read the Scripture we must FIRST understand that no matter of prophecy is subject to private interpretation.
Thus, it seems to me, and again I say this with all respect, that even by their own Protestant lights the entire Left Behind project is at radically at odds with the very Scriptures it purports to elucidate.
I ask one again the good Dispensationalists here to respond to this question.