Here's one explanation from the Washington Post:
Thank you, Viktor Orban, for showing us where the American right is heading.
I don't know about all of my readers here at P.E., but I do know that the men in my family -- my sisters' husbands -- (my husband wasn't born until after WWII) fought the Nazis in WWII. They fought against the idea of "racial purity" and the genocide of people who Hitler thought were not of the "pure" Aryan race. In fact, in my lifetime, I've never met an intelligent American who was FOR the idea of "racial purity" because it does not exist.
Right now, in America, in a country where thousands and thousands of men and women gave their lives fighting Nazism, a group of people, Trumpublicans, are now embracing and promoting a man who echoes what Hitler did in Germany in the 1930s.
Where is their shame? What the hell happened to these people? Where is their patriotism and honor for the men and women who fought and died for an idea that the Trumpublican Party now embraces?
"A gathering of US conservatives in Texas next week will still include Hungarian Prime Minister Viktor Orban as a speaker despite his recent comments which prompted a long-time ally to resign from his government and compare his comments to Nazism.