But it's about something I'm interested in. So, my apologies, but I'm changing the subject, anyway!

Any sort of weapon that is (or starts out) unconventional, or causes unusal injury, is detested by the receiver as unfair. This has happened over and over throughout history. Some good examples are the use of the glaive which caused horrific, but not immediately fatal injuries (I've heard that it tended to leave your intestines in a pile, but didn't kill you outright). Or anti-aircraft weapons used against infantry (another messy business). Or the example you gave of firebombing (Many of the Allies specifically referred to bombing of civilian targets during WW2 as a terror bombing campaign. These were proponants, not antagonists of the program, by the way).