http://www.raptureforums.com/Rapture/sixteenproofs.cfm
The link demonstrates the 16 reasons to believe as I do in the Pretrib Rapture of the Saints.
in case you miss it read my post #59 and I did go look at that link you posted.
The biggest problem with the teaching of a Pretrib Rapture is when it doesn't happen the way it has been taught as a theory is that many could fall away in thinking they have been deceived, 2Thess 2:3 and denounce Jesus as they take the mark of the beast in order to save their own life.
Pretrib theory was first taught by Margaret MacDonald in Port Glasgow, Scotland who first taught the pretrib view in 1830. Her theory was handed down to us through such men as J.N. Darby, Edward Irving, C.I. Lewis and many others to present day. Notice the word theory. Theory is just the carnal minds way of interpreting something. There is no scripture that speaks about a Pretrib, but those who have received Jesus being sealed by His Holy Spirit unto the day of redemption, Ephesians 1:13. The only way to break that seal is blasphemy against the Holy Spirit, Matthew 12:31. The falling away will be those who blasphemy the Holy Spirit and take the mark of the beast for they lack knowledge believing theories instead of Gods spoken word.