It is a bomb alright, but surprisingly that is the least of its problems. The bomb can be made strong enough to withstand great majority of accidents. Of course

It is a bomb alright, but surprisingly that is the least of its problems. The bomb can be made strong enough to withstand great majority of accidents. Of course it won't withstand some very nasty ones, but that rare possibility people could live with. The problem with hydrogen is there is no hydrogen available, we have to first generate it and distribute it to cars. So far this process is much more expensive than generating and distributing electric power.