"why is this Rabbi even in the IDF to begin with???" One would have to assume it is because the IDF staff believes that the values that he espouses are the values that need to be taught to the soldiers of the IDF. Whyever else would he be holding that job, israeliguy?
Rohani: Nuclear deal achieves Iran's goals (AP)
from the article: IDF Chief Rabbi: Troops who show mercy to enemy will be 'damned'