Likewise, the Mein Kampf and Capital analogies are inapt. It's not about refusing to read books.
Mr. Trump has decided to take many polarizing actions. We should not be surprised that they have caused polarization. It's a way to gauge how seriously one takes the issue.
Another analogy is boycotts and shunning during the South African apartheid era. Apparently uninvolved entities, like musicians and writers, were forced to either take a position against the apartheid state, or to tacitly admit the issue was not important to them. Eventually it became all but untenable to support the South African government policy.