In a printed press, or even their online edition, what goes in is subject to screening.
Yes, for legal liability.
The section of this newspaper is clearly marked 'comment is free' and expanded upon in the quotes I've posted above. The bias you and others are railing against should, in this case, be attributed to the author of the piece, not the newspaper. Editorial comment is clearly marked as such.
I've run a quick check on some of the contributors today :
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Syreeta McFadden is a Guardian US contributing opinion writer ...
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Ann Widdecombe has been a Conservative member of parliament for 20 years, ...She served as prisons minister under John Major and shadow home secretary under William Hague
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Simon Jenkins is a journalist and author. He writes for the Guardian as well as broadcasting for the BBC. He has edited the Times and the London Evening Standard and is chairman of the National Trust.
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Richard Stein is a partner at the law firm Leigh Day. His practice covers judicial review and human rights ..
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Anne McElvoy was a correspondent in East Germany, and is the author of East Germany's Life and Legacy. She is public policy editor of the Economist.
No comment on Syreeta, but the others aren't exactly your typical collection of biased, anti-establishment, left-wing loons - ( to use your inference).