Who was responsible for the crucifixion according to Acts 2 and Psalms 2?
According to Acts 2 and Psalms 2, the crucifixion was not solely Israel's fault. The Jews demanded it, but the Romans carried it out. Both groups acted together in consort, as Psalms 2 foretold the Gentiles raging and the rulers of Israel conspiring together.
Les explains that even though Peter in Acts chapter 2 only blames the Jew, we cannot just blame Israel for the crucifixion. The Romans carried it out, the Jews demanded it. Psalms chapter 2 gives the brief outline of the Old Testament prophetic program given to the Jew: the heathen or Gentiles rage, the people (Jews) imagine a vain thing, and the kings of the earth and rulers of Israel set themselves together. The key word is 'together'—they did it in consort.
The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, saying,