All I can say is the apostles did not interpret Jesus's words from the cross in the same way you do.
"Men of Israel, hear these words: Jesus of Nazareth, a Man attested by God to you by miracles, wonders, and signs which God did through Him in your midst, as you yourselves also know-- Him, being delivered by the determined purpose and foreknowledge of God, you have taken by lawless hands, have crucified, and put to death; (Acts 2:22,23)
Note Peter's words, "you have taken". And what was the response of the "men of Israel" to these words? "Now when they heard this, they were cut to the heart, and said to Peter and the rest of the apostles, 'Men and brethren, what shall we do?' " (v. 37)
Peter gives another "men of Israel" message in chapter 3. In that message he says, "But you denied the Holy One and the Just, and asked for a murderer to be granted to you, and killed the Prince of life, whom God raised from the dead, of which we are witnesses." (vv. 14,15) Again, the men were smitten by Peter's words and called upon the name of the Lord for forgiveness.
Stephen gives a similar message in Acts 7.
"You stiffnecked and uncircumcised in heart and ears! You always resist the Holy Spirit; as your fathers did, so do you. Which of the prophets did your fathers not persecute? And they killed those who foretold the coming of the Just One, of whom you now have become the betrayers and murderers, who have received the law by the direction of angels and have not kept it." (vv. 51-53)
Notice the parallel of Stephen's words about "killing the prophets" to those of Jesus in Matthew 23. These people were acting just like their fathers. But unlike the men in Peter's audience, these folks decided not to listen to the message, but rather to kill Stephen.
Those Jews who responded to the words of the apostles were included in the people of Israel being regrafted into the root. They were the ones in and around Israel who were to told to flee to the mountains to avoid the punishment to come. There made up the citizenship of the new kingdom, the leadership of which Jesus transfered from the old Sanhedrin to the new made up of the apostles and elders (cf. Matt 21:43).
So, if you read the entire Bible and don't prooftext your theology you'll come to a more satisfying understanding of the truth.
Sorry, but the Jews may have delivered Christ to the Romans for crucifixion, but they are not "responsible". God sacrificed his own son. They did not take his life, he laid it down. Hence no man is responsible for that crime. It was God's plan and God executed that plan perfectly in accordance with his will. And when it was all done, Christ asked his father to forgive them "for they know not what they do."