While I agree, I do not believe this is an appropriate excuse for ignorance (I am not accusing you of anything, just criticizing the viewpoint itself).
Computers are part of life. People know about antibiotics, vaccine, stem cells, black holes, and they know atomic radiation causes cancer and the same material can be used for atomic bombs, about wavelengths, and certain ones (UV) cause cancer by breaking DNA, etc.
But, not technology? How is there such a well-formed ignorance when it comes to technology? It's fed to us by the media too, who cite "computer glitches"[1,2,3] when something goes wrong, or when there is a breach of the system and all credentials stolen.
And, not understanding URLs leads to susceptibility to information being stolen from phishing attacks. Whose "fault" is there here?
[1] "Glitch" http://money.cnn.com/2013/12/26/news/companies/delta-ticket-...
[2] "Something broke" https://www.theguardian.com/technology/2016/feb/08/departmen...
[3] "Glitch" http://www.nbcnews.com/video/nightly-news/48088061
You don't need to learn about the Dewey decimal system when reading books, either. For the same reason - it's helpful for finding things, it allows you to classify books, and it doesn't matter at all since there are better ways to find books now.
They don't understand that when someone says "go to google.com" that something isn't wrong when the url bar says "https://google.com". They think they something is broken.
Heck, Safari now be default doesn't even show you the path, they just show the domain, because once people get to foo.com they don't even understand about the paths, nor care.