From a rather standard Aviv Lavie article about a film that interviews Israelis and Palestinians whose children have been killed in terror attacks and in IDF operations:

Arbel says that the main difference between the Israelis and the Palestinians was their attitude toward the deceased: "I was astonished to see that in most of the Palestinian homes there is a photograph of the child's body, sometimes with the bullet in the head. Can you imagine framing a picture of your child who has been shot?"

Seems to me that this reflects both martyr-reverence and a desire to keep the anger and drive for revenge alive.