Interestingly, the ICRC produced a major research report entitled People on War in 1999 which used opinion surveys to ascertain what different societies (including those with recent bitter experience of armed conflict) thought about the IHL and the laws of war.
The findings are interesting, especially since they do suggest emerging norms across multiple cultures. (Then again, it is often the attitudes of combatants, not civilians answering a poll, that may be most important--and those may be rather different.)
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