Why there are other programming languages besides Lisp? With Lisp's macro system you can create any language you need ever. Small, big, finely tuned for your task. Supporting other languages means opposing progress and delaying the inevitable future. There should be only one language and myriad languages at the same time. The one language is Lisp.
Funny, I got a resume that said they knew Scheme and actually cited SICP in their resume. I figured it was some idiot from this board. So me, along with HR did the logical thing. We threw the resume away and then sent this person a letter that basically said to the effect "Never apply here again".