If "we are all guilty," then why the constant constant accusation that the Jews killed him?
First, and foremost, that is not the first thing that comes to my mind... I think there are those who masquerade as Christians or immature believers who want to hold someone accountable...
Here are the words of a Jew written about the Jews of his day:
36 “Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified, both Lord and Christ.”
8 Then Peter, filled with the Holy Spirit, said to them, “Rulers of the people and elders of Israel: 9 If we this day are judged for a good deed done to a helpless man, by what means he has been made well, 10 let it be known to you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead, by Him this man stands here before you whole. 11 This is the ‘stone which was rejected by you builders, which has become the chief cornerstone.’ 12 Nor is there salvation in any other, for there is no other name under heaven given among men by which we must be saved.”
But here are Christ's own words too:
17 “Therefore My Father loves Me, because I lay down My life that I may take it again. 18 No one takes it from Me, but I lay it down of Myself. I have power to lay it down, and I have power to take it again. This command I have received from My Father.”
So, all are true... The Jews of his day killed Jesus. Jesus laid his life down. Our sins caused him to be placed on the cross.
Finally, it was the Father's will that Jesus suffer in our behalf:
Yet it pleased the Lord to bruise Him; He has put Him to grief. When You make His soul an offering for sin, He shall see His seed, He shall prolong His days, And the pleasure of the Lord shall prosper in His hand.