Nothing by me, but your answer may be found here: The Popes Against the Jews, Part 6:- http://beggarsallreformation.blogspot.com/2011/02/popes-against-jews-part-6-show-so-far.html
An understanding of Luther’s attitude toward the Jews can be seen here: http://tquid.sharpens.org/luther_Jews.htm
Peter did change the Jews with Jesus death in Acts 2, but we are all guilty of killing Christ, as my flesh and our is at enmity against God, and is irreformable (Rm. 8:7) ( if that’s a word). Paul, like Moses (being a type of him), was willing to be damned for their sake, (Ex. 32:32; Rm. 9:3) but also condemned them a whole and said, “wrath is come upon them to the uttermost,” as they harshly resisted the gospel, (1Thes. 2:16) with blindness resulting as a judgment. (Jn. 12:35,36)
But God promised a yet future reversing of the curse, and so all Israel (a remnant that is left) shall be saved, to the glory of God. (http://peacebyjesus.witnesstoday.org/israel-chosenorforgotten.html)
While the Romans did the actual dastardly deed, the Jews were really responsible for falsely accusing Him, turning Him over, and demanding His execution. And they did accept responsibility for it.
Yes, in one respect, we are all guilty, as our sin is what caused it to be necessary in the first place, but the Jews did take responsibility for it.