The nazis most likely used the death marches to

a - punish camp prisoners for uprisings.
b - move prisoners from one camp to another.
c - move jews from ghettos to concentration camps.
d - hide the proof of the holocaust.

They used death marches in order to hide the proof that the Holocaust happened or at least that it wasn't as bad as it was. In 1945 the Germans were decisively losing the war so the SS organized the so-called death marches. They were most likely called death marches by the prisoners and not the SS. They evacuated the camps to keep prisoners from getting liberated.

two months after his defeat of napoleon bonaparte's colonial forces, jean-jacques dessalines proclaims the independence of saint-domingue, renaming it haiti after its original arawak name. in 1791, a slave revolt erupted on the french colony, and toussaint-louverture, a former slave, took control of the rebels.

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.