Unless (as zionists almost always do) you start from the premise that any thing Israel does is correct because Israel did it, one has to face the reality that there are actions which shouldn't be done. One extreme and normally universally accepted thing that comes to mind is poison gas. It could save a lot of lives (on your side), but it's just wrong. Unless military commanders are reminded that some actions shouldn't be taken, they will be.
Pope Francis: Priests in Holy Year can absolve 'sin of abortion' (AP)
from the article: Investigating the IDF would be the real war crime