Amazingly the propaganda of the time still exerts it's influence a hundred years later.

I would say that statement is nonsense and challenge you to justify it.
Paxman in his programmes, informed by the OU History Faculty, said Britain was a much better place after the war.
Have you compared social conditions before and after?
I have not.

I think that all the European armies in WW1 used colonial troops.
What is your point?