Because the average temperature in the room also increased.
When we feel excitement, our blood will regulate faster and create faster metabolism. This will lead to higher body temperature because of the nutrient burning process. If this happen to all people in the arena, the average temperature is bound to be increased.<span />
The answer is the appeal of Hitler and the Nazi Party. Hitler made promises to the people that gave them new hope in the face of the economic crisis. His Nazi Party used propaganda and the media very carefully. This attracted people to their ideals. Therefore, the Nazi Party and Hitler became popular due to their appeal.
