The movies didn't fully explore just how addictive and warping seeing stones could be.
In The Silmarillion the point was made that they misled users who were weak while allowing users who were strong to mislead others.
Objective unbiased use for the greater good of all, while possible, was extremely rare.
The stones were an unreliable guide to action, since what was not shown could be more important than what was selectively presented. A risk lay in the fact that users with sufficient power could choose what to show and what to conceal to other stones. \*
Which nails a great issue with the concentration of data and data interpretation in the hands of a self selected few.
Only in the movies.