If anything, Nux, I'm surprised you're not an advocate of making English even more colorful than it already is, since you're obviously an advocate of the convoluted and confusing "proper" English.
Also note that slang is colourful and useful in it's own right, and even has it's own kind of maintenance. If you use slang wrongly in certain company, you can be seen as out-of-the-loop and just some guy trying hard (and failing) to be part of the crowd.
Language is very much a social thing and it can come down to proving yourself part of a group. I'd like to think there's more going on here than politics though and, if nothing else, I'm happier people speaking the language I've learned than speaking thier own distorted form of it, for clarity's sake.
It is not "their (
singular) own distorted form of it", but rather "their (
plural) own distorted form of it". I really believe that there isn't too much trouble understanding people who speak "broken" English; perhaps a second or two more thinking is in order, but if you're a competent speaker/writer/general linguist, then you shouldn't have too much trouble. It seems to me that you're denying that slang and common usage is part of the language when it most certainly is; on top of that, denying that anything not "book learned" is wrong, unprofessional, unofficial, etc. etc.. I think that, as a language lover, the worst thing you can do is wish it stays forever unchanged - condemning it growing stagnant and old as it moves through the generations forever being the same.
How art thou not in
agreeance?
TL;DR: Is change not good? What if English
never changed; wouldn't it grow old?? How can you deny the importance/validity of slang and common usage?
Apologies if this is somewhat inarticulate or poorly put; I just woke up.

EDIT: limh moose