Why is punctuation and capitalization such a lost art in chat? Do people just not know how to type? Are there still hunters-and-peckers alive out there?

Granted, I understand the informality of chat conversations, and will sometimes stray into the land of all lower-case myself, but to ALWAYS avoid the use of any capitalization or punctuation, I can't do it.

Punctuation for me is the guide to figure out if you're being sarcastic or just naive. It helps me determine if you're...