Point out the fact that the small one pound propane bottles are wasteful, expensive and that it is illegal (in the US) to refill and then transport them. It’s also hard to find places that will take them for recycle.
When someone objects to liquid fueled appliances in our troop, I also point out the physical characteristics of propane. Namely that it has to be compressed at room temperature or it will boil away and that it works poorly (stays liquid) at temps that are near freezing. Which is potentially more dangerous? A propane cylinder pressurized to 200 psi or a naphtha stove, usually pumped to less than 20 psi, unless you have a strong thumb.
If you have someone who claims that that liquid fueled stoves are banned by the BSA, point them to the 2010 BSA chemical fuel guidelines, which expressly recommend liquid fuels like camp fuel. Assuming you are in the US of course. Individual Councils and camps might ban them, but nationally they do not.
