This is the stuff my dad is really, really knowledgeable about. Back when he was still working for an engineering firm he did a lot of work for different municipalities and several PennDOT projects.
Last night after seeing the beet juice post I asked him about it. He told me beet juice has been around for a long time, maybe under different names but it's not a new product. He said when he was doing work for PennDOT they did an extensive cost benefit analysis study on probably a dozen or more alternatives to road salt, primary concern being bridge, overpass, and road surface deterioration. And the cost benefit analysis showed that there were several products that were actually worth using in the long run. He said one was some type of alcohol. However it wasn't a big enough cost difference and would take several years before costs started balancing out, and more importantly, it's all political. Try convincing politicians who know absolutely nothing about anything to use a slightly more expensive product now to save money in the long run. Politicians can't think more than 5 minutes into the future much less several years. And if it's more expensive, well that might cut into their annual raises, but they will tell you "It'll hurt the taxpayers, and salt isn't even corrosive according to our salt supplier (who the politician just happens to own a stake in) and blah, blah, blah..."
Ya know, politics.
You hit the description of a politician to a big capital T! they should change the Webster dictionary definition of a politician to IDOT