This is taken from an article at bethinking.org.
While the historicity of Herod’s slaughter of the innocent and the Jewish trial of Jesus in the Passion accounts have been questioned, no decisive arguments have been presented against them. This is, however, not the place to provide a robust defense of the historicity of the biblical accounts. Flemming’s video does not provide any more than assertions and, thus, I am not obligated to reply with a detailed refutation. I will comment that, in the first century, Bethlehem was probably a small village. Thus, the number of infants under the age of two would probably have been quite small. Would an action by Herod that caused the deaths of a small number of infants in a small village in an unpopular section of the Roman Empire have caught the attention of a number of ancient historians? We do not know. However, we should not be surprised if only one source reports it, in this case Matthew. For a good case for the historicity of Jesus’ trial by the Jewish leadership, see Craig S. Keener, The Gospel of John: A Commentary, Volume Two, 1085-89. See also Raymond Brown’s The Death of the Messiah, Volume 1, 328-83.
