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So firstly to stay on topic; ID cards are bad.
Then secondly, I think that the correct grammar is "Correct spelling and grammar are essential". Perhaps "correct spelling and grammar" is essential would work?! Surely combining two single nouns with 'and' makes a plural which needs 'are' (e.g Signe and I is/are disagreeing about grammar?)
So yes, I am one of those people that the new pledge is about.... it's a sad realisation..... I'm now going to go think about what I've done!sigh, 13 years ago.