Armchair pseudo-scientific thinking like this was why Mythbusters became so popular. They even devoted at least one episode to this very myth. Spoiler, hydrogen wasn't what made that particular lead ballon unsafe.

The problem wasn't hydrogen, it was the thermite the hull was made out of. Helium blimps blew up the same way soon after

I think you accidentally put helium twice in your second paragraph. Just wanted to let you know in case you want to fix it for readability.

I don't think airship travel is viable due to inability to properly steer them outside of very specific conditions, regardless of the filling. I would love to be proven wrong if it were somehow economic for shipping, but I have no high expectations.