It is crystal clear from this reading that Pontius Pilate did everything in his power to keep from condemning Jesus to death. However it is equally plain that the Jews were able to force Pilate to do their will in this matter. How was that possible? What did they have on him? William Barclay explains.
It is literally true that the Jews blackmailed Pilate into sentencing Jesus to death. The basic fact is that, under impartial Roman justice, any province had the right to report a governor to Rome for misgovernment, and such a governor would be severely dealt with. Pilate had made two grave mistakes in his government of Palestine.
In Judaea the Roman headquarters were not at Jerusalem but at Caesarea. But in Jerusalem a certain number of troops were quartered. Roman troops carried standards which were topped by a little bust of the reigning emperor. The emperor was at this time officially a god. The Jewish law forbade any graven image and, in deference to Jewish principles, previous governors had always removed the imperial images before they marched their troops into Jerusalem. Pilate refused to do so; he marched his soldiers in by night with the imperial image on their standards. The Jews came in crowds to Caesarea to request Pilate to remove the images. He refused. They persisted in their entreaties for days. On the sixth day he agreed to meet them in an open space surrounded by his troops. He informed them that unless they stopped disturbing him with their continuous requests the penalty would be immediate death. "They threw themselves on the ground and laid their necks bare, and said they would take death very willingly rather than that the wisdom of their laws should be transgressed." Not even Pilate could slaughter men in cold blood like that, and he had to yield. Josephus tells the whole story in The Antiquities of the Jews, book 18, chapter 3.
Pilate followed this up by bringing into the city a new water supply and financing the scheme with money taken from the Temple treasury. (This was referred to in Luke 13:1-5. Pilate had decided rightly that Jerusalem needed a new and improved water supply. He proposed to build it and, to finance it with certain Temple monies. It was a laudable object and a more than justifiable expenditure. But at the very idea of spending temple monies like that, the Jews were up in arms. When the mobs gathered, Pilate instructed his soldiers to mingle with them, wearing cloaks over their battle dress for disguise. They were instructed to carry cudgels rather than swords. At a given signal they were to fall on the mob and disperse them. This was done, but the soldiers dealt with the mob with a violence far beyond their instructions and a considerable number of people lost their lives.)
The one thing the Roman government could not afford to tolerate in their far-flung empire was civil disorder. Had the Jews officially reported either of these incidents there is little doubt that Pilate would have been summarily dismissed. It is John who tells us of the ominous hint the Jewish officials gave Pilate when they said, "If you release this man you are not Caesar's friend" (John 19:12) They compelled Pilate to sentence Jesus to death by holding the threat of an official report to Rome over his head.
It is also clear that Pilate had a record of making terrible decisions and the way he handled Jesus' case was just such another example.