Because decarbonization is being combined with all number of other social and technological changes. For instance, there is a strong connection between those who promote EVs and those promoting self-drive cars (ie Tesla). And there are connections between EV proponents and those who want to see fewer cars on the road. (Interesting doublethink there as reducing the cost of owning/operating a car won't exactly reduce their use.) The anti-nuclear crowd is tied up with many who simply want to reduce all forms of energy use. They generally dislike all large projects and want us all to run our own off-grid solar systems. I've even heard people rant about nuclear from a purely anti-mining perspective, not to mention those who cannot envision much difference between nuclear reactors and nuclear bombs.

Hydrogen is coming, just maybe not directly to cars for a while. The airline industry (big planes, not Cessnas) sees hydrogen as one of two options, the other being zero-emission hydrocarbons (fuel from air). Every airline exec dreams of the day they might generate their own fuel from water at plants right beside the planes. Airbus is working on a hydrogen demonstration rig inside an A380. Once airlines start generating their own hydrogen supplies locally at airports, a hydrogen fueling infrastructure for cars might just appear overnight.