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Breivik was a neo-Nazi, which is fundamentally Leftist. This confuses a lot of people because Nazism is so different from the Leftists we typically encounter, but Nazis view the government as a positive force and believe in enforcing equality (if you’re the correct race); both of these are Leftist traits.

Nazis fit in with one variety of the European right wing, which historically did believe in powerful government and in enforcing inequality (between classes or races or religions or ethnic groups).

Some liberals will tell you that the left was always peaceful and tolerant and kindly. It wasn't. But neither was the right, especially in 20th century Europe.

Conservatism also believes in adherence to the law (except for extraordinary circumstances, such as during the American Revolution), while mass murderers fundamentally do not.

People who turn to political violence usually do believe that we are living in extraordinary circumstances that justifies taking up the gun or bomb. They aren't conservative. But they may be right-wing. They usually aren't liberal either, though they may be left-wing.

Mass murder (when done to people not known personally, and planned out) is fundamentally done by Leftists. I will concede that a guy attacking people while on bath salts may not be thinking of Leftist political ideals at the moment, but it was Leftist thoughts which brought him to that state.

Sane, healthy, responsible people don't shoot up people they don't know. You can take pride in being sane and healthy and responsible I guess, but putting all good on your own side and all evil on the other side of the political spectrum looks like special pleading.

I don't believe that every mass murderer who happens to be a white guy is right wing or that Nazis or racists are conservatives, but I also recognize that not every awful thing people do can be blamed on leftists.

Maybe calling Breivik "right-wing" is wrong or inaccurate, but calling who somebody who ranted against "cultural Marxism" and political correctness a leftist doesn't get us closer to what he was.

[Objective Scrutator]

Nazis fit in with one variety of the European right wing, which historically did believe in powerful government and in enforcing inequality (between classes or races or religions or ethnic groups).

If they believe in government as a positive force, they're Leftists. Your position on the political spectrum is not determined only by how anti-Communist you are, even though Communism is necessarily Leftist. The big intellectual leaders of the European fascists were ex-socialists, and had similar beliefs in that people should serve the government, that capitalism was destined to fail, and in belief of some form of welfare (Mussolini and Hitler both proposed a form of nationalized health insurance to help the poor, for example). Where fascists and socialists/communists differ is that the latter are insistent upon equality of condition, whereas the former do not believe in equality quite to that extent and usually has a greater emphasis on exacerbating arbitrary differences. Conservatism believes in equality under the law, and nothing more (no "equality of opportunity" gibberish which liberals spout, but really want "equality of condition").

Some liberals will tell you that the left was always peaceful and tolerant and kindly. It wasn't. But neither was the right, especially in 20th century Europe.

Neither liberals or conservatives are fundamentally peaceful and tolerant, but only one of them lies and claims that they are. (Only anarcho-capitalists can reasonably claim that, and anarcho-capitalists are pretty naive.) Conservatives, at least, are only intolerant towards people who seek to be rewarded for their mediocrity and failure.

I also recognize that not every awful thing people do can be blamed on leftists.

When every awful person happens to be a Leftist, it's easy to look for where to point the blame.

calling who somebody who ranted against "cultural Marxism" and political correctness a leftist doesn't get us closer to what he was

Again, anti-communism is not exclusive to the right wing. Very few people of any political orientation deliberately call themselves "politically correct" (I've only even heard of stupid college kids who hate conservatism call themselves that); it's a term of disparagement used by people of all political orientations.