Ever heard the term, "don't knock it til you try it"? What do you have to lose by trying free operating systems? It costs nothing to run GNU/Linux in VirtualBox on Windows, and learning to interact with your machine from the command line will expand your skillset and your horizons, making you a better programmer and more valuable team player. Regardless, you're bashing people for using free operating systems in a security context, which is just asinine. This is not the holy war you're making it out to be.