I don't think it's 'PC gawn mad' its showing they are willing to stand by there political view point.
When that view point translates into Guardian picks being so out of kilter with the highest rated comments from seasoned and generally respected commentators whilst also ignoring data, then the argument of pressure on moderation is mute, especially considering they are just as guilty of publishing rage baiting/click bait articles and not checking sources just the same as any other publication.
Comments on news articles are generally a cesspit anyway, but when the majority of the reasoned responses are calling you out then its time to either look inwards or stick your fingers in your ears.
The guardian, being the guardian has decided to do the latter and invoke identity politics, any dissenting voices are the other, be that daily mail/red top reading (the mirror doesn't count for obvious reasons because they aren't as thick as the sun readers because of the team they support) or just trolls.
The culmination of not only accusing the initial 'Trojan horse' scenario in schools but also Rotherham/Oxford/Brimingham etc as being racist and to top it off with the initial reports and editorial line re the NYE attacks they are more prepared to die by their sword than admit the narrative has changed, that's all admirable and if they want to be as credible as huff po then so be it.
I will still read the guardian, I am using ad blocker when I visit now, but they do seem to be jumping the shark a little, trying to preach to the Corbyn supporters with the odd attack piece but also showing a lot of contempt for the adveredge left leaning person for nothing more than appearing or agreeing with some centre right ideologies (ignoring there centre right stance on btl and house prices).
It's become the embodiment of the champaign socialist slur used against it