I'm not even going to attempt to come in on one side of the argument or the other. I just get the impression that there are factors at work that are trying to game the system in favor of hybrids/full electrics and against diesels:
One reason is that the federal fuel tax on diesel fuel is now higher in the United States than the tax on gasoline. And to exacerbate the price, in the past few years, U.S. refineries have been eagerly exporting refined diesel fuel to Europe and emerging markets. In Europe, diesel pump prices are lower than gasoline prices.
I don't consider myself a conspiracy theorist but that looks like government and industry working together to discourage diesel as an option. I'd buy the energy self-sufficiency argument but for the fact that diesel is being exported from the US that could be kept in the US to power diesel vehicles in the US. It all just feels like another "my lobbyist can beat up your lobbyist" scenario to me.
Apologies for stating the obvious or ranting, I don't do it often.