The Germans also did medical experiments on prisoners. However throughout the war Hitler himself ordered that the Germans never use chemical weapons in combat. This was due to his being gassed in WW1. He knew the Allies would retaliate with gas attacks and the thought of German soldiers being gassed actually disgusted him.
The Germans also never attempted to develop or use biological weapons, unlike the Japanese.
When given the choice between big business and big government, choose big business. Big business never threw millions of people into gas chambers, but big government did.
"It does not take a majority to prevail, but rather an irate, tireless minority, keen on setting brushfires of freedom in the minds of men" -Samuel Adams