Our beliefs cloud our judjment.
Everybody has their "favourite" operating system. That's fine, in fact that's good. Everybody should have an operating system to champion. What is not good is when we allow our beliefs to blind us to the real facts of our chosen package of ones and zeros.
As most of you know my chosen operating system is Linux. I like it, I am comfortable with it. I promote it when ever I can. I believe that Linux in one form or another can do any computing task on the planet both now and in the future. As you just read I am not afraid to say that either.