Planting a dirt bomb in a civilian inhabited city is way beyond war... 99.9% soldiers fighting in a war would not participate in anything similar to this... Even when a city is bombed to the ground, that generally happens well after beginning of a conflict and most people have been at least given one chance to run away or surrender... Most people who plan their lives well enough have a decent chance to at least evacuate vulnerable people from war zones (at high cost, sacrifice, but still).
The propaganda people currently trying to blur such lines are CRIMINAL imo...
> like the Khmer Rouge
Not sure how well this (or anything else) worked for them... afaik they ended up massacring a large part of their civilians population because they were paranoid and couldn't figure out who to trust, or had crazy ideas about who the ideal future citizens should be...
Yeah, sure, torturing enemy fighters to give away military secrets probably works just fine, just don't do it on a large enough scale or you'll just motivate the enemy to faith-to-death instead of risking to get captured... and this would likely nullify any advantage you'd gain.
There's a big gap between "regular war" and "total unrestricted violence and terror", that's why we talk of "war crimes"...