Wrong. Only some of them are considered evil.
Are the Brits "evil", from whom we gained our independence and fought again in the war of 1812? Nope. The Spaniards or Mexicans whom we fought in the 19th century? Nope. How about the Indians - evil? Nope.
The Nazis? The Japanese fascists? The commies? Hell yes!
There is an interesting (albeit short) article in this week's Newsweek about the use of "evil" in defining groups of different polictical beliefs in the US. It doens't address the groups you are discussing here, but it might be an interesting point of view to look at.