Speaking as an iOS user...
(I'm sure I'll get voted down just for that alone)
One of the biggest problems I've come across in assisting the technologically-challenged has been the user himself/herself.
Even though I'm a Mac user myself, I help friends & relatives who have Windows PCs, too. I have recommended anti-nasty software to users on both platforms, and attempted to drum into their little heads the importance of good backup - preferably cloning their hard drive then executing an incremental backup at regular intervals.
With recommendations for AV software, I attempt to (metaphorically, of course) engrave upon their brains "UPDATE YOUR AV SOFTWARE" but do they do it?
I've just spent some time tidying up an XP system - assisted by my son - and the user asked me in a peeved voice "I installed the AV software you advised - so why is my PC infected?" My reply of course was "Have you kept the virus/trojan defs updated" and was advised "I shouldn't have to do that, should I?"
I thought I'd almost conditioned him to do it when I advised about the AV - BACK IN SEPTEMBER 2010. Apparently, some people think that software produced in 2010 should - by a process of osmosis - be fully conversant with ALL nasties produced since, without they themselves having to do anything about it.
Maybe you should have to have a computer licence, and three endorsements gets it suspended...