This is always assumed -- that the editors at Jyllends-Posten are liberal and that their intentions were innocuous -- but frankly this hasn't been proven. Some accounts I've read state (based on CIA Fact Book information) that the paper has a right-wing or center-right-wing political orientation. It's unclear how these labels correlate with how the terms are generally used in the US. I really wish US columnists would focus on the specifics about the paper and its editors rather than use political terms that don't directly translate into American usage, eg, a member of the Liberal Party in England would not have that much in common with an American "liberal."
I read in a story on yahoo, that Jyllands Posten created trouble in the sixties as well by attacking Khrutsjef (sp?). The paper was known for a heavy anti-communism stance.