Comparing someone or
something to Hitler during a political
debate in an obvious attempt at villification of the opposing argument, position or person. It is essentially a way of the Hitlerizer declaring they wish to cease
intelligent discussion and begin name-calling.
Since nobody over the
age of 5 takes you seriously when you
call someone else a "poopy
head", and Hitler is widely accepted as the embodiment of pure evil, adults can sometimes be found Hitlerizing their opponent's argument because, deep down, they feel their opponent is a poopy
head and need some other way of expressing that to avoid being laughed at.
In the Healthcare debate, for example, both supporters and opponents have begun Hitlerizing the other side.