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"They made a point of targeting property and carefully warning people away from their targets."
This is idiocy. Spend 5 minutes on google and find just how often the morons in the IRA justified their many, many mistargets with this reasoning. There are people in buildings. There are people inhabiting and working in property. The careful warnings are bullshit. They go awry. They come too late. Bombs blow things up and those things disperse as shrapnel. The statue they blew up created a force that blew out nearby windows and threw parts of the statue off onto a nearby road. How is that "targeting property" and not putting people at risk? What kind of nitwit can't understand that an explosion creates force beyond the site of the blast? You seem to be confusing actual explosions with the movie explosions, where the heroes outrun the blast and emerge with a little black smoke on their faces.
Your defense is crap because it's simply not true. The bomb that exploded and killed his comrade was a nail bomb. What's the purpose of a nail bomb? To blow nails all over, and harm anyone in the range of the blast. If no one else was killed or hurt, it's by luck, not design.