I presume you mean the Haskell crowd? The Lisp crowd is more about expression rather than "correctness" and rigidity. FP doesn't really have a formal definition.

> trying to evangelize the world of programming to do things one way; their way.

I think the world of computing is shifting towards a lot of async work, and if you've ever written large threaded apps, having too much state becomes the greatest of burdens. Clojure, for example, minimizes state and uses Software Transactional Memory to manage mutability.