If you ever wanted to dork out and read about prescriptivism vs descriptivism, well, now you can.
I tend to lean more towards the descriptive camp, mostly because I get annoyed by people who correct other's grammar, who say "ain't" and "irregardless" aren't words, and especially those who get pleasure out of "knowing how to speak properly" -- a guise for "better than the next guy."
English is a fluid concept, an amalgam of languages, and never was there an Académie française to govern how people use it.