Petroleum jelly and jellied petroleum are two different animals, the former is flammable but rather harmless beauty aid, the latter is an improvised explosive/flame weapon. think napalm....
Yeah I’m familiar with napalm, but napalm isn’t C4 either. The LEO was suggesting the perp had made C4 not napalm. Besides you make napalm with gasoline and a thickener not Vaseline.