I think, quite on the contrary that humanity is strongly opposed to ignorance. People continually seek to acquire knowledge and they always have an urge to pass on their knowledge to other people. This is reflected in stories, written history, songs, and other forms of communication. I think what does end up happening is that many humans learn something that comforts them or makes them feel accomplished (Which is another thing that humans strive for), but is inherently false. This is why religion is extremely popular, and why people enjoy stories and myths even though they have very little truth to them.
Additionally some people are just plain not exposed to what others would consider "true" knowledge, or knowledge that is actually backed up by facts and valid arguments, and so they form their own conclusions and seek to answer their questions by themselves.
In an isolated society this information does not get disproved or nullified, but rather gets expanded upon and passed down. These people do not consider themselves ignorant as we consider them, but rather enlightened, and they form a sense of uniqueness and belonging with their own ideas.
"Ignorance" is not the lack of knowledge in general, but a lack of knowledge relative to what other people consider it to be.