Language and Propaganda

According to this website, these terms have an actual meaning attached to the softened meaning. (Listed Literal=Actual)

exterminated=murdered
liquidated=murdered
finished=murdered
actions=missions to seek out Jews and murder them
evacuation=murder
resettlement=murder
treated appropriately=murdered

As you can see, each word that is actually being used has been softened so it does not sound as drastic. The easy, cool softening of each word makes them sean easy and well-suited.

On a Nazi poster, it would say "Help us liquidate the poison of mankind and create a new, strong, Aryan nation!" Rather than saying "Help us kill all Jews to make a new race of Germans!"
The first is obviously much more appealing to any person. Adolf Hitler did not sway between each usage -- he did not care which term was used because each meant the same thing in his mind. But the people in Germany were swayed by the bias that seeped in quietly, attacking without them noticing.