Pilate was on very thin ice with Caesar, especially considering he had already used troops to crush and earlier minro revolt and sent them into the temple afterwards. Later on after Jesus' death, he was relieved of service after another massacre, but Augustus died when he was on his way back to Rome, so Pilate never had to face him. Rahter, after a trial, he was exiled to switzerland. He was trying to not get executed like his mentor, I forget his name, so he appeased the Jews so he wouldnt have to put down a revolt. Was he a coward, depends on how you look at it, but he was definetely willing to hear Jesus out on his last question to him, "What is truth?" but the Bible records he went back out to the Jews after this question and didnt stay for an answer. He wanted to believe Jesus, IMO, but succombed to the pressure on him.