1. The main purposes of the Nazi antisemitic laws and policies were to create their ideal society filled with only "worthy" and "superior" people. Basically, eliminating anyone and everyone who didn't fit their ideal model of a person.
2. The idea of race was infused in the laws and policies because the German's/Nazi's saw almost every group that wasn't white and Christian/catholic (I think those were the 2 religions) as inferior. They saw themselves as the superior race and made it a recognizable saying from that time period.
3. The actions taken by individuals and communities added force to Nazi policies because they reenforced the hatred and segregation and would carry out acts of hateful, spite filled violence on the groups that were targeted.
4. The overall impact that those laws had on Jews was horrifically negative. It resulted in the mass murder (the Holocaust) of anyone of that religion or inferior race (a genocide). I'm not sure what you mean by "On German society mote broadly", sorry.
5. There are a lot of other systems and laws that have dehumanized people. One would be segregation. Another would be locking immigrants in cages at the border and separating them from their families. Forcing Jews to wear The Star of David on their clothes or LGBTQIA+ people to wear a pink triangle on their clothes, as if they were a animal being branded. Some have led to genocides and others have not. It all depends on where the majority and strongest group of people with power lie for each issue.
Hope this helps - just my best guess! :) If you use any on these, please paraphrase!!! :]