Growing the Linux Community
Engaging in arguments about the superiority of one computing environment over another with individuals who are every bit as convinced of their view as your are of yours is a fruitless endeavor. I used to have lengthy discussions on the relative merits of Linux over Windows or Mac OS X, or BSD, or BeOS, or any combination thereof, none of which turned out to be a productive use of my time, or anyone else's time involved. I like to think that I've grown out of the need to defend my choice of computing platform, and instead focus on what I can do. It is always best to let your work speak for itself.
My suggestion to the people leaving comments in favor of Linux and who wish to help spread its adoption, or to influence the direction of the desktop environment, is simple: do great work. Do great work, and then write about it on your blog. Many of the comments are long enough to be great blog posts. Be so good they can't ignore you.