While I don't agree with parent which seems to me denying the killing ever happened, remember that the Whole bible is symbolic, even when talking about historical events. In fact there are 4 interpretation layers, and this already noted in the old testament. Literal, allegorical, anagogical, moral. There are passages that DO NOT MAKE SENSE unless symbolic, example:Its not.
"When it was evening, the disciples came to him and said, “This is a deserted place, and the hour is now late; send the crowds away so that they may go into the villages and buy food for themselves.” 16Jesus said to them, “They need not go away; you give them something to eat.” (Matthew 14).
This is clearly symbolic for their mission, because there is no way he was expecting a bunch of discipled to have brought enough food for the crowds in advance. You can track all four interpretation layers in this passage.