Do mercenaries from 3rd world countries have a place in a modern fighting force?

After the Battle of Monte Cassino:
>"The French colonial troops are on the rampage again. Whenever they take a town or a village, a wholesale rape of the population takes place. Recently all females in the villages of Patricia, Pofi, Isoletta, Supino, and Morolo were violated. In Lenola, which fell to the Allies on 21 May, fifty women were raped, but – as these were not enough to go round – children and even old men were violated. It is reported to be normal for two Moroccans to assault a woman simultaneously, one having normal intercourse while the other commits sodomy. In many cases severe damage to the genitals, rectum and uterus has been caused. In Castro di Volsci doctors treated 300 victims of rape, and at Ceccano the British have been forced to build a guarded camp to protect the Italian women."