Capitalism? What? Fascism has nothing to do with that. Ideas are entirely responsible for fascism. Material conditions? I don't know what the fuck you're talking about. Fascism wouldn't have existed if Hitler either died as a baby or hadn't written Mein Kampf.
Oh, and, by the way, WWI could have been averted if that archduke didn't get shot. There is nothing more to the outbreak of WWI.
Sincerely, libs.
BBC bad, but they at least manage to wave a hand towards it being because of national tensions in a form factor for 8 year olds Link