“I will pour out on the house of David and on the inhabitants of Jerusalem, the Spirit of grace and of supplication, so that they will look on Me WHOM THEY HAVE PIERCED; and they will mourn for Him, as one mourns for an only son, and they will weep bitterly over Him like the bitter weeping over a firstborn.
“In that day there will be great mourning in Jerusalem, like the mourning of Hadadrimmon in the plain of Megiddo.
“The land will mourn, every family by itself; the family of the house of David by itself and their wives by themselves; the family of the house of Nathan by itself and their wives by themselves;
the family of the house of Levi by itself and their wives by themselves; the family of the Shimeites by itself and their wives by themselves;
all the families that remain, every family by itself and their wives by themselves." (Zecheriah 12:10 - 14 Emphasis mine)
It seems that God does hold the Jews partially responsible because they will, after over 2,000 years recognize Christ "whom THEY have pierced" and they will mourn for Him.
They will mourn because at last they will realize that the Lord Jesus Christ, the very one they rejected and had crucified and who arose from the dead, is in reality THEIR Messiah, the one they have been waiting for throughout their entire history! The good news is they will repent as a nation and finally accept Him as their savior and Christ.
According to Acts 2:23, in the predetermined plan and foreknowledge of God, the Jews nailed Jesus to a cross by the hands of godless men and put Him to death. Those are the facts, that along with the reality that I crucified, Christ. He died because of MY sin and in My place.