The Nazis murdered millions of men, women and children. Their victims weren't "collateral damage" in a war, and they were not executed after a long and fair trial. The Nazis sent their victims to gas chambers and ovens in boxcars. Nazi scientists injected dyes into the living eyes of small children to see if they could be made "Aryan." They made soap out of people.

What on earth has George Bush done that deserves such comparisons? What could he possibly do?

If you're going to call the man a Nazi, show me the children with tattoos on their arms. Show me the stockpiles of emaciated corpses. Show me files cabinets full of memos detailing how Bush and Cheney plan on disposing of millions of dead American citizens killed with poisonous gas.

If you can't show me any of these things - and you can't - then stop calling the man a Nazi. Because when you say he's no different from Hitler, you are also saying that Hitler is no different from George Bush. And that means that Hitler's crimes were no worse than George Bush's "crimes." And whatever you think of what George Bush has done or might do, if you think any of it is the moral equivalent of the Holocaust, you are in effect saying the Holocaust really wasn't that bad.

This isn't a partisan point. I would make the same argument if Al Gore were president. I loathed Bill Clinton as president, but I always took pains to chastise conservatives who compared him to Stalin or Hitler. As bad as Clinton's behavior was, only a man in leave of his senses would compare it to the systematized and bureaucratized mass-murder of millions of people. The same goes for Bush.

To what should be their enduring shame, leftists have a particular problem understanding this point. In their do-gooder arrogance, many on the left assume that anyone who stands in their way must not be merely wrong on the facts, but evil in their hearts. And, worse, they have a very difficult time differentiating between evils.

My favorite example of this moral myopia comes from a few years ago. Rep. Charles Rangel, D-N.Y., said of the Contract With America: "Hitler wasn't even talking about doing these things." And his colleague, Rep. Major Owens declared of the new Republican leadership in the House, "These are people who are practicing genocide with a smile; they're worse than Hitler."

If you believe such nonsense, just get it over with and say the Holocaust never happened at all. Because at least that form of Holocaust denial admits that if it "had happened," it would have been a really bad thing. Saying the Holocaust is no worse than tax cuts or some such doesn't even give the victims of Nazism that dignity.