That's exactly the problem here. A typical user who adds capitalization to make her password more difficult to guess is basically screwed over by Blizzard who h

That's exactly the problem here. A typical user who adds capitalization to make her password more difficult to guess is basically screwed over by Blizzard who has decided that passwords don't need to be case-sensitive. Users who opt to (I'm not talking about forcing users to use capitalization here) to use capitalization for a more secure password are unaware that their efforts are in vain. Also, it isn't only trivially more guessable. That's nonsense. If you're using a password list and you capitalize only the first letter of every password in that list, that list is still double the size of the first list.