You miss the point.
As did you. It is possible to be so ignorant on a topic that one doesn't even know where to begin with teaching themselves. With the wonders of the internet it is much easier to find information, but finding information suited to such a beginning level is still difficult. So imagine that there is a person, let's call him Slowy McSlow, who has heard about Linux and is interested in installing it on their computer. They decide to inform themselves of how to do such a thing. So they call upon the arcane powers of the interwebs and summon forth what appears to be the perfect article: A Beginner's Guide to Installing Linux. As a beginner into the field of computer-whatchamacallits, a beginner's guide seems wonderful! Then they read the article. It makes assumptions. It isn't really a beginners guide intended for the unwashed masses but rather for individuals already familiar with computer-whatchamavallits. Slowy McSlow, being a member of the unwashed masses, a member who notably was attempting to educate himself (hence why he was reading the article in the first place), reads it, and is disappointed. There is not truth in advertising, from his perspective. Could he go learn all the technobabble necessary for him to understand the article? Sure, but that isn't what the article promised (from his perspective). He’s attempting to educate himself, but the article mocked those attempts.
There is no justification for willful ignorance and that's something I'm not going to back down on.
Charlemagne, Æthelberht of Kent, Jordanes, polypropylene, Augustine of Hippo, Augustine of Canterbury, epigenetics, micro RNA, mRNA, spissitude, MC4R pathway, glass transition state, SCA, Asia, positive punishment v negative rewards, GNS theory, dice pools, branes, chryssalids, aaaaand Darkwing Duck. There, you now have a lovely list of topics that you may or may not be knowledgeable about. If you do not go investigate the ones you aren't familiar with, then you are willfully choosing to remain ignorant. When you get done with those, I am quite sure I can come up with another small selection to keep you busy. And another. And another.
Not giving a flying rat’s ass has traditionally been a very legitimate form of justification for people willfully remaining ignorant on a whole host of topics. What turns this into a vice is when the individual willfully remains ignorant on issues that are important. Of course, what counts as being important tends to be rather subjective.