You could translate that, ‘But the chief priests urged the people [to require] that [Pilate] should rather release Barabbas unto them.’ The people were urged by the chief priests and they responded, but they too were responsible.
How fickle the people are! How quickly they have gone from crying ‘Hosanna to the Son of David: Blessed is he that cometh in the name of the Lord’ (Matthew 21:9), to calling for his death. It is easy to get caried away by a great national movement, without it affecting us personally. There is a great difference between being carried along by the crowd and making a personal response to God ourselves. Without true conversion the church of God cannot be impressed by reformation of life, nor with loud praises to God, for it is quite possible for those who do not know the Lord to be temporarily lifted up to a state of great excitement and admiration for the visible signs of religion while the root of unbelief remains in them and will in due time resurface again. It is always dangerous to trust the sentiments of the unconverted.