I think it may be counter-productive to mention this, because it is difficult to prove. It is trivial to show that there are dead-weight costs incurred when computer systems need to deal with DST across political boundaries. Those costs alone should be sufficient to convince anyone to abandon DST (or just as well, adopt it full-time, as Russia recently did). The fact that "normal" people do not know these costs exist is, I think, the main reason they are sympathetic to emotional arguments such as "DST will save children's lives on Halloween" or equally your "DST kills drivers once or twice a year."