According to the concept of reincarnation, a person would hope to return as a human

the correct answer is in a higher caste. This concept of reincarnation revolves around the idea that once someone dies, there souls will live on in a new form. The goal in this idea for many people is to do well in their current life so that they may rise in social status in their next life. Many people believed that if they did everything they were supposed to during their current life, they would be rewarded in their next life.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.