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

Back when parsing and compiling was real expensive and would take all night it was advantageous to the compiler if it didn't have to worry about case.

Once identifiers came in to existence that were only unique via their case it became very difficult to go back. Many developers liked it and there doesn't seem to be a big desire to undo it.