You're point is well taken about use of the word Nazi to discribe Bush's crimes against humanity. But only the German fascists, which is what the Nazis were, specifically choose the jews as their national enemies. If you look to what the Nazis had in common with all other fascist states, you will see that fascists choose "non-nationalists" and minority races as degenerate...say, lowerclass blacks, illegal mexican immigrants, Moslems and homosexuals...and in this, they are right in line with Bush priorities.
John Dean in talking about the same issues, used the word
"authoritarian" to discribe the Bush/Cheney gov't, but I think he is erring on the side of indulgence. Authoritarians are not necessarily
empire builders, devoted to illegal wars to build their own wartime industries, but fascists are.
Authoritarians, like the paleo-conservatives, support the constitution, but interpret it in the most conservative way. Fascists, on the other hand realize that the Constitution is all that stands between them and the permanent party-government that they desire.
If you wish to describe the Bushes properly, fascists is the proper word, but you'll still have a fight to make your point, as fascism is such a loaded concept.
Still, study fascism, learn about it, and you'll see that it's the proprer word to describe what the Bush neocons are attempting to do.