I don't see any use for case sensitivity in a programming language, apart from obfuscating code.

Why implement this in a programming language? 

Update:

It looks like someone you know made a statement on this.

While case folding is fairly trivial in English, it's much less so in some other languages. 
If a German programmer uses ß in a variable name, what are you going to consider the upper-case equivalent? Just FYI, "ß" is only ever used in lower case. OTOH, "ss" is equivalent -- would you consider a compiler obliged to match them? When you get into Unicode, you get even more interesting problems, such as characters with pre-composed diacritical marks versus separate combining diacriticals.  Then you get to some Arabic scripts, with three separate forms of many letters, rather than just two.

In the dark ages most programming languages were case-insensitive almost out of necessity. For example, Pascal started out on Control Data mainframes, which used only six bits per character (64 codes, total). Most such machines used the "CDC Scientific" character set, which only contained upper-case characters. You could switch to other character sets, but most had either upper-case or lower-case, but not both -- but used the same codes for both. The same was true of the ancient Baudot codes and such considered standard in the beginning days of COBOL, FORTRAN, BASIC, etc. By the time more capable hardware was widely available, their being case-insensitive was so thoroughly ingrained that changing it was impossible.

Over time, the real difficulty of case-insensitivity has become more apparent, and language designers have mostly decided ("realized" would probably be a more accurate term) that when/if people really want case insensitivity, that it's better handled by ancillary tools than in the language itself.

At least IMO, compiler should take input exactly as presented, not decide that "you wrote this, but I'm going to assume you really meant something else." If you want translations to happen, you're better off doing them separately, with tools built to handle that well.
