Sometimes pointing things out is useful.

Watson and Crick pointed out that a double helix was the structure of DNA most compatible with results from x-ray crystallography experiments and then went on to win a Nobel Prize (they did not discover DNA, by the way—Miescher did, in the 1860s). In the 1960s, the publication by Kempe et al of "The Battered-Child Syndrome" pointed out that parents are often the ones to blame for mysterious injuries to their children (before this it was considered impossible or at least improbable that parents would ever willingly injure their own children).

These examples aside, in my experience problems are generally obvious, or at least well indicated by others' pointing. What's needed is not more pointing. What I'd like to see is more action!