Why are many languages case sensitive?

Question

Why are many languages case sensitive?

Is it simply a matter of inheritance? C++ is case-sensitive because C is, Java is case-sensitive because C++ is, etc.? Or is t

Answer 1

Case sensitivity doesn't really help case consistency.

Foo.Bar  
foo.Bar  
fOO.bAR  

In a case insensitive language that can be fixed automatically by the editor easily. In a case sensitive language fixing it it's harder as it may be legal. The editor first has to ckeck if foo.Bar and fOO.bAR exist and also has to guess that you typed with the wrong case rather than forgetting to declare the variable (as Foo is different to fOO).