>Everyone has seen the consequences of pilot lights going out while owners are on vacation. House fills with natural gas, fridge compressor kicks on, ignites gas, house explodes. A house filled with hydrogen would not only destroy the house containing it, but the houses next to it as well, and it would be much more likely to ignite due to its much lower ignition energy.

So Its molecule is so tiny it's hard to contain even in specially constructed containers, but in a house leak it'll hang around and build up enough in a house to level a suburb block?

You can't have it both ways.