Yeah and two spaces after the ! also.
But if your sentence were "Turkeys are called turkey because..." you still couldn't use case to help.
Thinking as a programmer, not a linguist, my question is "which policy on case-folding makes it easier to write programs?" And the answer is that when I tell the user "Enter yes or no" it's easier if I don't also have to check separately for Yes and No. Or, I ask myself "which kind of bug will be harder to find, one in which words the user expected to be unequal compare equal, or one in which words the user expected to be equal compare unequal?" That one doesn't have as clear an answer, but I lean toward thinking that it's easier to notice the pun of the bird and the country having the same name than to notice why I typed "brian harvey" into a name field and it didn't match any record -- which never happens, I point out, in real software, because all real software correctly case folds.