Here's some more that came to mind:
Hiram Maxim who invented the first fully-automatic Machine gun. "If you want to make real money, invent something for those damn-fool Europeans to kill each other with".
There's also
Mikhail Timofeevich Kalashnikov, inventor of the ak-47, but the soviets didn't have enterpreneurs. Well, that's a technicality if you ask me. Probably no man has done more to protect children than he has:
The AK-47 has saved more children's lives than UNICEF and all other liberal scams combined.