That Melania Trump's speech Monday night at the Republican National Convention contained material plagiarized from Michelle Obama's speech at the 2008 Democratic National Convention is not the most significant issue in the world. But it genuinely is one of the most important things that happened at the Republican National Convention so far.
The bigotry is, yes, bad. But people know all about it. To Trump supporters, the fact that he says and does offensive stuff is what's appealing about him. Most white people think antiwhite discrimination has become a bigger problem than bias against blacks, and Trump's pitch is that he'll shatter the bonds of political correctness that are oppressing America. Harping on the fact that this is what Trump is doing — that his campaign is about fear of the other, not "economic anxiety" — is true and important, but it simply reiterates the point that campaigns are in part clashes of incommensurable values.
Plagiarism offers a window into a different aspect of Trump, one that isn't integral to his appeal. Trump is a phony. And a lazy one at that. He refuses to put in the work, and if he becomes president the consequences are likely to be disastrous and unpredictable.
Just ask his wife who stood up on a nationally broadcast prime-time telecast to vouch for his integrity and decency, and turns out to have been set up for humiliation because Trump couldn't be bothered to build the kind of professional presidential campaign that would equip Melania Trump with a decent speech.