Good arguments for why Python is a great little language, but no convincing ones regarding Lisp: there are no large software projects undertaken in Lisp recently (or ever?) that have failed because of it's extreme flexibility making collaboration impossible, no lisp programmers complain that there are too many ways of doing things or about "conceptual clutter" (ok, after my encounter with CL I'd complain about it, but I never got any real work done in CL so my opinion doesn't matter - maybe the "conceptual clutter" would've ended up to be "invaluable expresivity/flexibility" in a real world project) etc.