What's your proof for the bolded? You were the one to assert that Si and Fe were responsible for the promulgation of racism. How did you reach that conclusion?
I have no proof. How many times does it need to be said that typology isn't provable? It's an abstract labeling system, so I'm unable to prove anything about function theory.
I can give you abstract theoretical reasons as to why Si/Fe might yield a racist belief system, and the reasons will be based on how Si/Fe affects one's cognitive processes. I don't think that all racists are Si/Fe-ers, nor do I think that all Si/Fe-ers are racists. I also don't think that Si/Fe as functions themselves align with racist ideals. However, I do think that Si/Fe, moreso than other functions, can have a tendency to yield a racist ideology, especially in regards to the American racist.
Again, it's important to note that I do not think the principles of racism as an ideology are in any way aligned with the cognitive governance that occurs as a result of Si and Fe. I do not believe that Si/Fe in and of themselves yield a belief that says one race is superior to all the others or that Si/Fe are responsible for instilling the kind of fear that it takes to believe that your own race is superior. I simply believe that Si/Fe can perpetuate racism in an environment that already upholds racist ideals (thus cause racism in America on a societal scale).
Anyway, here's my reasoning:
Brief (and perhaps somewhat oversimplified) historical summary of racism in America:
Africans were brought here as slaves and treated as inferiors for generations.
Africans, as opposed to other ethnicities (I know there are many many many African ethnicities, but I'm trying to be succinct here), were vulnerable to slavery for a whole slew of reasons, but essentially their vulnerability was due to certain social dynamics occurring in many areas on African soil and the European belief that those of a different color skin were "savages" and easiest to conquer and use in garnering some kind of profit.
Slavery was abolished in America after many generations of legality, and it would be another 100 years before African Americans even began to experience the extent of their freedom. This is because Americans, for generations, were raised in a world where blacks were treated as inferior beings, and certain societal stigmas existed due to past experience (Si), and such societal stigmas were upheld on an individual level (Fe).
Why I correlate the aforementioned with Si and Fe:
Si causes us to store data from our experiences and refer back to it in order to contrast the current moment with the past. Therefore, Si may yield a conscious value system that is based off of tradition, and an Si-er may be inclined to adhere to what he or she has always known. This can make an Si-er more susceptible to certain forms of indoctrination (familial or societal) and an inability to break out of the "what has always been" shell. Therefore, one who was raised in a racist world and witnessed the inferior treatment of African Americans (during slavery or post-slavery) would adhere to the belief that African Americans are indeed inferior because
this is what experience tells them.
Gather data from experience --> store it in a database --> refer back to it in the current moment as a roadmap to guide you through new experiences
Repeatedly witness blacks treated as inferiors and see that a society in which blacks are treated as inferiors is a contented society --> Store this knowledge --> continue to treat blacks as inferiors because it correlates with the contentedness of society and changing from this may cause a disruption to such content
In short, American society as a whole continued to believe that blacks were inferior because
this is what we always witnessed to be true. We referred to our past data and concluded that since blacks were brought here to be inferiors and were always treated as inferiors, they will thus always be inferiors because
that's the way it has always been. Si is the function responsible for this kind of thought process.
Fe, on the other hand, has a tendency to cause the Fe-er to adhere to certain social norms and group values (especially when accompanied by Si) for the sake of maintaining a sense of outer social harmony. Therefore, one who is raised in a predominantly racist world will adhere to racist ideology because that's the social law. Fe may cause one to have the unconscious thought process that says "I'm a proud American, Americans are racist, so in order to uphold a sense of pride for my nationality, I will be racist as well." You can substitute any group identity for American into the former sentence, and the cognitive state will still align with Fe. The Fe-er wants to fit in with current social mores because that causes the most optimal sense of outer harmony, and this is another reason for why one who is raised under a racist ideology may not have any interest in breaking through the confines of such a belief.
Again, and it sucks that I even need to add in such a disclaimer:
I do not believe that all Si or Fe-ers are racists, that all racists are Si or Fe-ers, or that Si and Fe as cognitive functions definitively align with racism.
This is such a mouth-dropping misapplication of MBTI...I think I lost a little respect for some people in this thread. No one is stopping to question if this is taking it a little too far? Some of the replies in this thread illuminates how clearly some people need scapegoats and that's made all the more easier when you have a handy four-letter coding system to slot them into. 
) and what a complicated mess of psychology, sociology, geopolitics, and economic push/pull factors they are, if you armchair psychologists can pinpoint specific functions that give rise to racism then go back reread everything you just read but this time with some reading comprehension and critical thinking skills.
