It is a "Conscience Matter".
Back around 1995 my cousin died in a violent freak car crash. He was driving home from work when his front tire caught a pot-hole on the edge of the highway which grabbed his tire causing his car to sling-shot across the highway. His car was t-boned by another and was literally ripped in half with him in it.
His body was so messed up that his parents (prominent JWs in the area) had him cremated.
What is sad is that at his funeral, which had a very large turn out due to the family's prominence, the elder giving the talk had to briefly address the concerns some had regarding him being cremated.
Think about it: JWs are so twisted and judgmental that at my cousin's funeral the speaker had to justify the way his body was handled.