The G2SS Policy on the Storage, Handling, and Use of Chemical Fuels and Equipment prohibits the use of homemade alcohol stoves such as the Pepsi can stove. It classes isopropyl alcohol, denatured
ethyl alcohol, and ethanol as not recommended. Taken together one may purchase an alcohol stove and use it with the fuel it was designed for. In BSA's Scouting Community Richard Bourlon, BSA's safety director, indicated the policy change was due to "high profile" accidents involving alcohol fuel handling. From his comments the policy changes were not made on the basis of material properties like flash point, vapor pressure or combustion product toxicity relative to those of recommended chemical fuel.
Ultralight backpackers may keep their Trangia stoves and/or purchase a Caldera Cone system which comes equipped with commercially manufactured can stove identical in configuration to one on http://zenstoves.net/Stoves.htm. Alcohol fuels used in accordance with the stove manufacturer's instructions.
Recognizing that I could be accused of hair splitting, the subject revision seems to be a knee jerk response to bad press. It is easier to prohibit use of a device than motivate a volunteer population to effectively train existing safety practices.