All current renewable energy sources have one big flaw. They produce energy when the circumstances are right, not when required. Beacause of this they cause issues in the energy grid.

If we could build water cracking facilities at the right scale with the right characteristics, that could help offset the efficiency/cost issues.

And on the issue of high pressure fire bombs, gas powered cars are pretty common here in Europe and those things are pretty safe. There are numerous safety features, not to mention that gas tanks are pretty tough vessels.

Edit: On the topic of fire bombs. I have today learned that one would not want Hydrogen tank in his vehicle.