They "failed to recognize Him"

The inhabitants of Jerusalem and their leaders failed to recognize him, and by condemning him they fulfilled the oracles of the prophets that are read sabbath after sabbath. For even though they found no grounds for a death sentence, they asked Pilate to have him put to death, and when they had accomplished all that was written about him, they took him down from the tree and placed him in a tomb.

-- Acts 13:26-33

The historical complexity of Jesus' trial is apparent in the Gospel accounts. The personal sin of the participants (Judas, the Sanhedrin, Pilate) is known to God alone. Hence we cannot lay responsibility for the trial on the Jews in Jerusalem as a whole, despite the outcry of a manipulated crowd and the global reproaches contained in the apostles' calls to conversion after Pentecost. Jesus himself, in forgiving them on the cross, and Peter in following suit, both accept "the ignorance" of the Jews of Jerusalem and even of their leaders. Still less can we extend responsibility to other Jews of different times and places, based merely on the crowd's cry: "His blood be on us and on our children!", a formula for ratifying a judicial sentence. As the Church declared at the Second Vatican Council:

. . . [N]either all Jews indiscriminately at that time, nor Jews today, can be charged with the crimes committed during his Passion. . . [T]he Jews should not be spoken of as rejected or accursed as if this followed from holy Scripture.

-- CCC 597