If they're Nazis, make Hitler salutes, and fly flags with swastikas on them, of course I do! That's practically the point of ideology lmao
People wear transgressive symbols and put on transgressive displays in order to piss others off and show their own independence. But wearing a Che Hat doesn't make you a communist, neither does sporting a hammer and sickle arm band. Neither does singing the International. Please don't confuse performative displays with the real thing: kids dressing up as historical cowboys and indians are not actually cowboys and indians. Stop pretending.
Lastly, we don't live in a society of self-help for this stuff. You are obligated to rent to anyone who can fulfill the terms of the lease, and if you don't like that, then get out of the rental business. Let the police be the ones charged with preventing mass extermination. Petty discriminations don't help protect anyone.
Yes, the "Nazi ideology" espouses this. But you are renting to actual people, and
1) You have no way of knowing whether _they_ really espouse the ethnic cleansing of you and yours, or whether you just think they do. Lots of people wear swatstikas but they don't actually favor mass extermination. There are holocaust deniers who are called Nazis and maybe even view themselves as Nazis but, pretty much by definition, don't support the holocaust. As another example, elsewhere in this thread you have made characterizations about me that don't have any basis in reality, so who is to trust you to decide whether someone truly wants to ethnically cleanse you and yours?
2) even if they were _actual_ Nazis, which you have no way of knowing, by renting to them, you and yours are not going to be ethnically cleansed. The fact that someone has a political belief is not in and of itself a cause to make them fail to pay rent or fulfill any other of their obligations as tenants. As a result, in many jurisdictions, it's illegal to not rent to them.(a)
3) There is a strong likelihood that landlords will end up refusing to rent to people whose views they don't like. A capitalist landlord can refuse to rent to a communist, because the communist wants to overthrow them. That will turn into not renting to someone who is interested in communism, etc, which will turn into not renting someone who attends a communist rally. Someone else in this thread decided that a Swatstika on a "friend" would be enough evidence, so now we are getting into not renting to someone based on their associating with people suspected of Nazism, etc.
(a) In California, it is illegal to not rent to someone based on "arbitrary characteristics" not related to their ability to fulfill the terms of the lease. See, e.g. http://articles.latimes.com/2014/mar/30/business/la-fi-rentw...
Again, the laws differ jurisdiction by jurisdiction.
Believe me, it's not the leftists who end up owning most of the property. These protections are part of living in an open society in which people are not discriminated against based on their beliefs. As we get more of a housing crunch and in many cities there is a growing population of renters, it becomes more important that your political affiliation not disqualify you from access to shelter. This may mean that some landlords have to rent to those whose politics they dislike, but that's the price of living in a free society. You are free to espouse any ideology you want as long as you don't break any laws.