I admit to being something of a grammar snob (hey I was an English major after all :-). However, there's grammar and then there's grammar. I suspect most of the "problems with grammar" come from non-native speakers of the language which makes sense. English is one of the hardest languages to learn because the rules for grammar and spelling are chaotic (mix of Germanic and Romantic language loan-words with Latin grammar hammered down on top of it plus a whole mess of other seemingly arbitrary rules and conventions). The doesn't even get into slang and other such constructs.
in reply to Grammarians: do we need a new group?
It might be helpful for non-native speakers to improve their grasp of the language, I don't think this is the forum for such things. This is PerlMonks after all, not LanguageMonks :-)
Just my 2 quid and remember, English is one of the only languages where you can go phishing for ghoti with a fishing pole :-)
update: fixed spelling error s/grammer/grammar/. Thanks for pointing this out Fletch
update 2: even native speakers have problems with the "rules". How many grammatical mistakes can be found in this post (sentence splice has already been found - thanks theguvnor).