The rulers in Psa 1 are identified in fulfilled prophecy. Take a look.
Acts 4:5 And it came to pass on the morrow, that their rulers, and elders, and scribes,
6 And Annas the high priest, and Caiaphas, and John, and Alexander, and as many as were of the kindred of the high priest, were gathered together at Jerusalem.
7 And when they had set them in the midst, they asked, By what power, or by what name, have ye done this?
8 Then Peter, filled with the Holy Ghost, said unto them, Ye rulers of the people, and elders of Israel,
9 If we this day be examined of the good deed done to the impotent man, by what means he is made whole;
10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, [even] by him doth this man stand here before you whole.
11 This is the stone which was set at nought of you builders, which is become the head of the corner.
12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
23 And being let go, they went to their own company, and reported all that the chief priests and elders had said unto them.
24 And when they heard that, they lifted up their voice to God with one accord, and said, Lord, thou [art] God, which hast made heaven, and earth, and the sea, and all that in them is:
25 Who by the mouth of thy servant David hast said, Why did the heathen rage, and the people imagine vain things?
26 The kings of the earth stood up, and the rulers were gathered together against the Lord, and against his Christ.
27 For of a truth against thy holy child Jesus, whom thou hast anointed, both Herod, and Pontius Pilate, with the Gentiles, and the people of Israel, were gathered together,
28 For to do whatsoever thy hand and thy counsel determined before to be done.
Now it is proven that the word people in Psa 2:1 is singular and is the people of Israel, singular.
What else do they have wrong?
Acts 4:5 And it came to pass on the morrow, that their rulers, and elders, and scribes,
6 And Annas the high priest, and Caiaphas, and John, and Alexander, and as many as were of the kindred of the high priest, were gathered together at Jerusalem.
7 And when they had set them in the midst, they asked, By what power, or by what name, have ye done this?
8 Then Peter, filled with the Holy Ghost, said unto them, Ye rulers of the people, and elders of Israel,
9 If we this day be examined of the good deed done to the impotent man, by what means he is made whole;
10 Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, [even] by him doth this man stand here before you whole.
11 This is the stone which was set at nought of you builders, which is become the head of the corner.
12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
23 And being let go, they went to their own company, and reported all that the chief priests and elders had said unto them.
24 And when they heard that, they lifted up their voice to God with one accord, and said, Lord, thou [art] God, which hast made heaven, and earth, and the sea, and all that in them is:
25 Who by the mouth of thy servant David hast said, Why did the heathen rage, and the people imagine vain things?
26 The kings of the earth stood up, and the rulers were gathered together against the Lord, and against his Christ.
27 For of a truth against thy holy child Jesus, whom thou hast anointed, both Herod, and Pontius Pilate, with the Gentiles, and the people of Israel, were gathered together,
28 For to do whatsoever thy hand and thy counsel determined before to be done.
Now it is proven that the word people in Psa 2:1 is singular and is the people of Israel, singular.
What else do they have wrong?