Tossing away money on technology that will never work.
I wouldn’t mind it at all if it wasn’t my money.
When discussing technology, it’s best to never say never. (Please note: I’m not saying that any of these technologies positively will work. There’s a difference.)
However, it is extremely foolish to subsidize the full-scale implementation of new technologies before they’ve proven themselves. (Actually, it’s foolish to subsidize at any time. Once the technology has proven itself, it doesn’t need a subsidy.)
A strong case can be made for subsidies for doing the basic R&D, which can be done at a small fraction of the cost of subsidizing implementation of immature technologies.