The correct interpretation of this program should be, it helps motivated students who were earlier deprived of learning opportunities but doesn't seem to have effect on others. Just because the program didn't help all types of students as reflected by the average effect, doesn't mean that we disbandon the program. If motivation turns out to be the hindrance, then this should be worked on but not stop the program.
Michael Clemens and Justin Sandefur wrote this amazing article on worm-wars explaining the results of replication study of the famous deworming paper by Michael Kremer and Ted Miguel. The example discussed here also demonstrates that average effects can be misleading.
I am reproducing the relevant text and images from the CGDEV article here below.