Ahhh look friend, I am endorsing the PRE-TRIB rapture. Because it is Biblical boilerplate doctrine.
These passages are absolutely clear as a bell.
1Th 5:2
For yourselves know perfectly that the day of the Lord so cometh as a thief in
the night.
We can see from Matthew when this coming of the Lord as a thief will occur.
Matthew 24
21 For then shall be
great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.
...
29 Immediately
after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the
Son of man coming in the clouds of heaven with power and great glory.
31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
The coming of the Son of man is set AFTER the tribulation. Then we read in this same passage.
Matthew 24
43 But know this, that if the goodman of the house had known
in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up.
44 Therefore be ye also ready: for in such an hour as ye think not the
Son of man cometh.
So we see the coming of the Son of man, compared to the coming of the thief is set 'after the tribulation.
And pre-tribbers typically set the rapture somewhere around Revelation 3 and 4.
Revelation 16
15
Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
Pre-tribbers see this passage as deep into the tribulation period. But the coming as a thief thing still applies.
And this also exposes a problem with pre-trib. The immediate audience of his letter was for the messengers of the seven churches, who were supposed to hear the letters. And here is a message warning the churches that the Lord is coming as a theif and blessing the one who watches and keeps his garments.
This is supposed to be encouragement for the churches. But how can pretribbers interpret this except to divorce it from it's actually, quite obvious, immediate audience, and make it only applicable to some future group that even aren't a part of the church according to pre-tribbers.
And pretribbers do all of this without a single shred of Biblical evidence that Jesus is coming back two more times or that there is an additional coming of Christ to accompany the rapture besides the one described in Revelation 19.
1Th 5:3
For when
they shall say, Peace and safety; then sudden destruction cometh upon
them,
as travail upon a woman with child; (BIRTH PANGS! SEALS!) and
they shall not escape.
1Th 5:4
But
ye, brethren, are
not in darkness, that that day should overtake you as a thief.
Compare that to the exhortation from Revelation 16, buried deep in the 'tribulational' part of Revelation, about watching and keeping garments clean.
1Th 5:9
For God hath NOT appointed US to wrath, but to obtain salvation by our Lord Jesus Christ,
The saints described in Revelation love not their lives, even to the death. The overcome Satan by the blood of the Lamb and the word of their testimony. There is no reason to think that God is angry at them. That does not make much sense. Since they believe in Jesus, we should believe that God saves them, that they obtain salvation through our Lord Jesus Christ.
There is no evidence for a pretrib rapture in the verses you quote.