As is often the case when you post about this, there's a great point buried underneath your signature posting style. Historical-critical scholars are almost universally of the belief that Pilate was much more bent on executing Jesus than the Bible suggests and that the Gospels stressing the culpability of the Jewish leadership instead was a writerly choice with political and strategic dimensions to it.
The strongest evidence for this hypothesis is that in Mark, Pontius Pilate is not shown to be as hesitant as he is in the other, later Gospels.
The strongest evidence is that crucifixion was a punishment for rebellion against the Roman state. If the Jews had been involved in Jesus' execution then he would have been stoned according to Jewish law.
Its my impression that while the death penalty technically existed in Jewish Law, it was a dead letter at the time. Is that not accurate?