CRI, I think I can understand a bit the source of your frustration, and I think it comes from a missing piece of the picture from your part and a lack of explicit explanation of that missing piece from others.
Your hypothesis is that racism is the
cause of the election of Donald Trump. As part of your evidence for this, you are focussed on the
effects of racism elsewhere in the US. You have ended up defending the political concepts of identity politics and intersectionalism as a result of this focus on the effects. This takes the form of arguments along the line of "being black and poor results means you face additional problems".
But you should take a step back to notice that these intersectional concepts are indeed about the
consequences of structural, widespread racism (and misogyny and homophobia etc) on
individuals. They do not say much about what drives the actions of those
not within those intersections of minority categorisation. The fact that being black and poor means you face additional problems does
not mean that those who are white and poor
want you to have additional problems, or would choose to load additional problems onto you, all else being equal.
Here are three statements that are not equivalent to each other:
1) People voted for Donald Trump
because he is racist
2) People voted for Donald Trump
and didn't care that he is racist
3) People voted for Donald Trump
in spite of the fact that he is racist.
Your position relies on a belief in statement 1, but your evidence concerning structural racism in the US
at best provides some support for statement 2. But statement 2 doesn't actually give us any reason why people voted for Trump, it just tells us why they didn't not vote for him.
That's where your analysis of voting necessarily
ends, but it's where all these other analyses of voting reasons
begin. They accept that there is sufficient structural racism to mean that a racist candidate is not automatically anathema. But they also accept that this is in itself enough of a reason to mean that people choose to vote for him. There has to be something else going on, unless voters actively
want racism, and there is no evidence of that. (In fact, there is counter-evidence, given the population's willingness to twice vote for Obama).
The more sophisticated hypothesis, in other words, is that yes, Trump's racism didn't matter (enough) to voters, but the reason it didn't matter was because he presented some reason to vote for him that otherwise appealed, plus the alternative candidate did
not present reasons that sufficiently appealed.
Factors from the above argument are also the basis for the critique of identity politics as it applies to solid political action. OK, being black and poor means you face additional problems -- so now, what are the concrete actions that should be taken to face this inequality? Should those actions involve atomisation (inevitably leading to even more people not within the intersection
not caring that a candidate is racist), or should those actions involve collectively recognising where the structural problems
derive from (not just what their consequences are) and tackling those underlying problems head on?