Propane is massively explosive too but people have learned how to handle it. Hydrogen is less dangerous than propane because escaped hydrogen floats into the atmosphere at 45 MPH, whereas propane sinks and collects, waiting for a spark.
An article in EV World details an experiment by a U of Miami professor who wanted to see the difference between a hydrogen car fire and a petrol car fire. Guess which one was more dangerous? Article here: evworld DOT com/article.cfm?storyid=482
H2 isn’t just for cars- you can cook with it, heat homes and fly drones for 4 hours instead of 20 minutes. Hydrogen is the next big thing.