I can drive a car safely and responsibly, fill it with fuel, check the oil and tyre pressures, but if anything needs repairing or maintaining I am lost. Does this mean I shouldn't be driving?
Nope, it just means you shouldn't attempt to "maintain" or "repair" anything because you have the knowledge that you don't have enough knowledge in order to do those things.
I can screw a new faceplate onto my light switch without electrocuting myself. Could I install new, recessed lighting in my kitchen? Hell no, because I don't know how and I
know I don't know how, so I would defer that to the professionals.
Same as on a computer:
WEBSITE: "You need to install this codec in order to view this Quicktime movie."
INTERNET USER: "What's a codec? I wasn't even trying to view a movie!"
WEBSITE: "Ok, download is done. Ready to install codec."
INTERNET USER: "Oh, ok. What a helpful thing this internet is! Here is my administrator password. Do what you please, installer!"
What
should have happened in that situation is the user should have deferred installation of the "codec" to the professionals... or simply backed out of the site. It's when a user blindly proceeds forward without knowing what will happen next that they get
themselves into trouble.
MacGuyver
knows what will happen next when he cuts the red wire on the bomb...
you, on the other hand, do not, and you will blow yourself up trying.
And just because they fall for it once doesn't mean they shouldn't be using a computer at all. But if they fall for it again, then you really have to question their common sense, or memory, or cognitive abilities, or something.
Fool me once, shame on you. Fool me twice, shame on me.