They took no prisoners because too many Japanese booby-traped themselves with explosives or handgrenades or had knives, pistols, and other weapons hidden on their persons. The Marines found it was expedient to just off all prisoners, at least until the island was secure.
I'm with you. In one of his entries he said they would have the newest guy in the group "off" the wounded Japanese. If he refused, they got rid of him.
Do you not think this is happening in Iraq. It also happened in Vietnam.
I've never heard of this. I do know that the Japanese were adverse to surrendering. Most would choose death over surrender. They were fanatics.
Once they surrendered it was considered a war crime to kill them.