Calling someone a "Nazi" and "concentration-camp capo" is prima facie proof of a weak case, if not a weak mind. It is a subtle acknowledgement that the argument is already lost; that is, a case cannot be made on its own merits.
EXAMPLE: Best Comment Ever
By: John Cole August 30, 2005 at 4:55 pm
I have had a few pieces of hate mail, and I have weathered some pretty stupid commentary, but this is hands down the best comment I have ever received (for sheer entertainment value):
Dear fascists on this site:
I am a liberal.
I would rather live as a slave on my knees…
...then die on my feet as a warmonger.
Cindy is better than Jesus and Rosa Parks. You are worse than Hitler.
Fuck off.
A liberal
Worse than Hitler? C’mon Miss Lewinsky, get off your knees.
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http://www.balloon-juice.com/?p=5426