It seems entirely apiece with how a rule begins ("Don't cite tertiary sources like encyclopedias, Wikipedia is an encyclopedia, so don't cite Wikipedia") and then gets simplified to the point of uselessness ("Don't cite Wikipedia", then finally "Don't use Wikipedia") and then generates its own inverse rule ("If it's not Wikipedia, you can use it").
At each stage the why gets shaved off and then people come up with their own reverse-engineered explanations ("Don't use Wikipedia because it's edited all the time by randos, so it's less reliable than the other stuff you'll find online").
You can see this with, eg, p-values- people learn the rule "A p-value measures the probability of obtaining the observed results, assuming that the null hypothesis is true." which becomes "a low p-value means we should reject the null hypothesis" becomes "a p-value is the probability the null hypothesis is true" (the inverse).
At each stage the why gets shaved off and then people come up with their own reverse-engineered explanations ("Don't use Wikipedia because it's edited all the time by randos, so it's less reliable than the other stuff you'll find online").
You can see this with, eg, p-values- people learn the rule "A p-value measures the probability of obtaining the observed results, assuming that the null hypothesis is true." which becomes "a low p-value means we should reject the null hypothesis" becomes "a p-value is the probability the null hypothesis is true" (the inverse).