I understand that point of view and wish to submit scripture for consideration with the Lord otherwise.
2 Thessalonians 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, 2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. 3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; 4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
I apply 2 event here where the first event is why Jesus is coming as the Bridegroom for the abiding bride of Christ.
Paul goes on to signify that the iniquity at work in these latter days that is causing the falling away from the faith was happening even in his day.
5 Remember ye not, that, when I was yet with you, I told you these things? 6 And now ye know what withholdeth that he might be revealed in his time.
7 For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way. 8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
This is in regards to the falling away from the faith rather than that son of perdition at the end of the great tribulation. Everyone will know the son of perdition will be leading the world's armies in marching unto Jerusalem and so there would be no "revelation" there, especially since the beats is waging war on the saints thru out that whole time during the great tribulation to kill Christians by the words & hunger because they need the mark of the beast to buy & sell to survive.
So the Wicked shall be revealed that causes the falling away from the faith as Paul continues to address that iniquity next in why God would permit the strong delusion to occur on saved believers that fall away;
9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders, 10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. 11 And for this cause God shall send them strong delusion, that they should believe a lie: 12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
If they believe the lie that they can receive the Holy Ghost again or apart from salvation after a sign
1 Corinthians 14:20-22 KJV or prompted to seek salvation by receiving the Holy Ghost by a sign
Matthew 12:39-40 KJV, God would permit that strong delusion to occur.
Paul goes on to give the reproof towards that lie by reminding believers of the traditions taught of us for when we had received the sanctification of the Spirit & the belief of the truth which was at the calling of the gospel and at no other time.
2 Thessalonians 2:13 But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because
God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth: 14 Whereunto he called you by our gospel, to the obtaining of the glory of our Lord Jesus Christ.
15 Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.
Now for that "damned" part of 2 Thessalonians 2:12 as if inferring they were never saved or that they had lost that salvation for falling away from the faith; not so because of the Father's will here
John 6:39-40 KJV There are 2 kinds of vessels in His House and the vessels unto honor are the ones that had departed from that iniquity as well as other iniquities by His grace & by His help before the Bridegroom had come whereas the ones that did not are the reason why they are called the vessels unto dishonor but still in His House
2 Timothy 2:18-21 KJV, albeit left behind to receive their stripes per the knowledge they had for not being ready
Luke 12:40-49 KJV from the Father as they will never commit those sins again
Hebrews 12:1-11 KJV at their resurrection after the great tribulation
Revelation 7:9-17 KJV.
We read on to how Paul address those who have fallen away from the faith and no longer walking after the traditions taught of us and are disorderly as they are in slain in the spirit, holy laughter, & using tongues for private use today which is not of Him at all, that Paul says we are commanded from the Lord to withdraw from them but not to treat them as the enemy, but admonish them as brothers because they still are, but at risk of being "damned" vessels unto dishonor in His House, unless they repent with His help before the Bridegroom has come. We can trust Him to do a good job in being faithful in keeping the souls of His saints that shall suffer being left behind
1 Peter 4:17-19 KJV
That is how I see Him destroying that Wicked at the brightness of His coming when those left behind see that Wicked and their iniquity which was really after the workings of Satan all along.
Since at the end of the great tribulation, He is doing a whole lot more than that by "the brightness of His coming" in "destroying" the world's armies marching unto Jerusalem when His feet will touch down on the Mount of Olives and since there is no "reveal" there as to who that Wicked one is, then I apply that to the iniquity that is causing the fall away from the faith today in these latter days for how the brightness of His coming shall reveal and destroy that Wicked & iniquity off of that foundation of the saints left behind but that foundation shall remain as that seal of adoption is too for why they are saved see verse 15 in spite of physical death in verses 16-17
1 Corinthians 3:10-17 KJV
Anyway, this is why I believe your reference was actually towards the iniquity that causes the falling away from the faith that was to happen first before our gathering unto Him at the pre great tribulation rapture event as I see why saints are warned to repent as in be ready as found abiding in Him or else be cast into the bed of the coming great tribulation.
Revelation 2:18-25 KJV