When it comes to video editing, Windows and Mac rule the screen. Professional apps by the likes of Adobe, Avid and Apple only run in the Win/Mac world and Apple even throws in a pretty sophisticated video editor (iMovie) for free.
No matter how much you love Linux and open source software, you’re never going to get Adobe Premiere or Avid running on a Linux box. If it makes you feel better, most of the massive render farms at studios like Pixar run exclusively on Linux. No? Me either.