I'm not a real trusting person. Wasn't there so didn't see the musket loaded. Could have been "operator malfunction". As far as the manufacturer goes, I just don't see a whole lot of wisdom in buying something, especially something that is supposed to contain an explosion, from someone or an entity that has little if anything to lose if that item fails.
Also, there is reason to be suspicious when a particular country has a well publicized reputation for both producing junk and treating their workers like k-rap.