If it was known, it could be error, deceit, laziness, etc. But the true nature of reality isn't known it is only believed, but human belief tends to be conside

If it was known, it could be error, deceit, laziness, etc. But the true nature of reality isn't known it is only believed, but human belief tends to be considered (appears as) knowledge once an adequate amount of people in a society believe something to be true - 100 years ago religious beliefs were the dominant truths, now science is the top dog. Specific object level beliefs change over time, but human nature seems to be much more immutable.