His reason was His Own Purpose. He decreed their damnation. He made them for destruction anyway Rom 9:20-22
20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?
21 Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour?
22 What if God, willing to shew his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction:
They were appointed by God to disobey the word and be damned 1 Pet 2:8
8 And a stone of stumbling, and a rock of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed.
So His reason was because He so purposed it.
You ignore the context. God sent the deluding influence in judgment of those who rejected Bible truth.
Now, you again ignore the context of Paul's statement about the potter. The example in context is Pharoah, not righteous people but sinners. They are the same lump of sinners, God uses them for His purposes:
17 For the scripture saith unto
Pharaoh, Even for this same purpose have I raised thee up, that I might shew my power in thee, and that my name might be declared throughout all the earth.
18 Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.
19 Thou wilt say then unto me, Why doth he yet find fault? For who hath resisted his will?
20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?
21 Hath not the potter power over the clay,
of the same lump to make one vessel unto honour, and another unto dishonour?
22 What if God, willing to shew his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction:
23 And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory,
24 Even us, whom he hath called, not of the Jews only, but also of the Gentiles? (Rom. 9:17-24 KJV)
Here the purpose is stated. God could make sinners "toilets" or "mansions", but God is doing this to make known His glory to the Righteous, "vessels of mercy".
So "vessels of wrath" are sinners, God didn't make them sinners. That "sinful lump of clay" God makes different vessels as He sees fit.
And He does this to illuminate "vessels of mercy" "make known the riches of his glory on vessels of mercy".
And the "vessels of mercy" have different jobs to do in the church:
28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
29 Are all apostles? are all prophets? are all teachers? are all workers of miracles? (1 Cor. 12:28-29 KJV)
Peter warned you Calvinists, as well as everyone else, Paul's letters are deep, hard to understand. It would be nice if you heeded Peter and stopped implying there is "unrighteous with God"
God has mercy on some evil lumps of clay and makes them into vessels of honor, how many evil kings etc exist? Lots. God also doesn't have mercy on some evil lumps of clay and makes them into vessels of dishonor, but in neither case did He make the clay evil.
15 And account that the longsuffering of our Lord is salvation; even as our beloved brother
Paul also according to the wisdom given unto him hath written unto you;
16 As
also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction. (2 Pet. 3:15-16 KJV)
