Many people repeat factoids. That's why it's good to verify before repeating.
Yes, your sources are wrong. DNP wasn't used as an ignitor of dynamite. First, it wasn't used as an ignitor. It has a high activation energy. Second, it was used in synergistic mixtures with trinitrophenol (TNP) and TNT. The French are the most well known for using DNP for this purpose. They commonly used mixtures of 40% DNP and 60% TNP. These explosives had nothing to do with dynamite. They were more often TNT based, and in the case of the French munitions, even this aspect was lacking.
I didn't wage any insults. As for who cares, I do. And you should too. I realize you're only trying to help, which is commendable, but passing around misinformation is a disservice to the bodybuilding community. Everyone needs to care about accuracy... otherwise, you're just being careless.