Where has one single historian dismissed all the reasons for men joining up in the way you have

I have not dismissed them.
There were as many reasons for joining as there were men who joined, including all your 14.

The historians tell us that the main reason for joining was to resist the German conquest, and defend Britain and Europe.

Dr Dan Todman.
"Sassoon and Wilfred Owen could be used to evoke an emotional reaction against war which engaged students and satisfied teachers, but which utterly misrepresented the feelings of most Britons who lived through the war years.

The extent to which this mythology was shared made it an attractive setting for television series and historical novels."
http://www.bbc.co.uk/history/worldwars/wwone/perceptions_01.shtml