I must admit I've never really understood the squeamishness about napalm. It's ok to blast someone to pieces with high explosives or rip them apart with flying shards of metal, shoot them, stab them, strangle them, drown them or crush them in a holed submarine, fry them with thermobaric missiles...but it's not ok to incinerate them with napalm.
They are all violent ways to go.
The key word is unnecessary suffering.