Because it's really that important.
A bingo caller has been advised to stop using phrases such as "two fat ladies" for fear of offending his audience.
A council spokeswoman told the East Anglian Daily Times: "In particular with John being a councillor we have to be politically correct."
She added: "It is very sad because it is part of the fun of bingo but unfortunately in today's society people take it literally."
And why do people take it literally in today's society? Simply for the fact that they have been systematically conditioned to do so by a succession of overpaid and underworked politicians and local burghers. National and local legislators who have filled their days, which would otherwise have been empty, by dreaming up new offences to place in the minds of a public who would never have had the time or imagination to think such things a problem before.
They have to be PC, as they claim, because their profession invented it, incubated it, nurtured it, and expanded its remit to such an extent that every minor, and even inconsequential, aspect of the community is infiltrated by the political class's promotion of intolerance and self-absorption.
It's not unfortunate that the public take such things literally, it's instead scandalous that such ideas of offence, where none is remotely intended, were planted in the minds of society, by overthinking councillors and MPs, in the first place.