I would submit that the greatest favor one human could do for another is to train them in the recognition of the common distortions of logic:

a. Falsification of data
b. Misestimation of importances
c. Altering the sequence of events
d. Asserting logical conclusions that are not logical
e. Falsifying the time of events.
f. Inserting irrelevant information.
g. Omitting relevant information to distort conclusions
h. Claiming similarities where there are differences, or insisting on differences where there are similarities.
i. Claiming that things are identical which are not.
j. Claiming things are different which are identical.

There are probably a few more but those are the main ones I can think of. If a person's analytical skills were sharpened up to the point where he was never fooled by these distortions when presented by PR artists or advertisers or other liars, he would be a stronger, clearer-minded person.

A