People who make excuses for or actively advocate closed-source OSs and network software (and yes, Apple/iOS fanboys, I'm looking at you) are not merely harmlessly misguided cultists. They are enemies of liberty – enablers and accomplices before the fact in vendor schemes to spy on you, control you, and imprison you. Treat them, and the vendors they worship, accordingly.
Cisco provides a lesson in Armed and Dangerous (5 July 2012)