He paved the way for an eventual Nazi takeover in the United States as a reaction to his policies. He yielded so much to Stalin that even his own government officials were alarmed at how accommodating he was.He gave global capital the biggest hit since Lenin, he ensured that France and Italy would have a lot more socially liberal regimes, he aided in a more gradual, respectful, and less hastened decolonization, he weakened some of the most reactionary actors of OTL, plus East Europe will most likely not be as bad as OTL, and Spain may return to being a democracy a lot sooner than IOTL. Not to mention that he started desegregation earlier as well.
I’m not an American, so I don’t care that much about American-Japanese relations, but a Japan that is more left-wing is almost always a good thing in my book.
Also, him shooting his own people in the back is crazy to even argue. That is such a defeatist attitude, and only further legitimizes anti-semitic scare tactics. If White is showing one thing, it’s how much good a single Jew can do, and though he has made uncountable amounts of enemies, he will also cement his place into the history books as one of its unlikeliest heroes.
He imposed republicanism on Japan in a way that seems designed to discredit him forever.
He implemented the Morgenthau Plan in a way that sounds more like "I'm exactly the kind of Jew Hitler was fighting against," and refused to implement the Marshall Plan, preferring instead to leave Europe at the hands of the Stalinists. He started helping the fucking Maoists!
His way of imposing his changes by decree and without ensuring support, pulling "I am the President, do what I say" made sure to validate all the anti-Semitic conspiracy theories.
The TTL world will think that White is "proof" that "Jews are dangerous" and should be "kept in check". And anyone who thinks "White did a lot of good" will be socially dead as a "traitor to America." Moreover, the fact that there are people who want to keep the "White Diktats" will be read as "proof" that all these people are communists. Although that doesn't make any sense.
And of course the "White Diktats" will be nullified immediately, and if anyone protests, well, the National Guard is there to combat communist subversion (?)