Dave, to know what people thought about the war, you have to research what they said about it at the time.
Overwhelmingly the people supported it, and not because they were lied to or duped.

Jim, I am trying to imagine a history course that requires students to attend lectures on WW1 for ten years!
Who gave those lectures Jim?

I learn history from the history books.
Nothing written for at least twenty years supports the old myths that you still cling to.
Why is that Jim?
Dave?
All liars?
All deluded?