We study the impact of yoga and meditation on various cognitive and behavioral functions. Our results suggest that meditation can produce experience-based structural alterations in the brain. We also found evidence that meditation may slow down the age related atrophy of certain areas of the brain.
Have you looked at the work of Sara Lazer PhD?
https://scholar.harvard.edu/sara_lazar/publications
And that’s just from one researcher.
A Systematic Review and Meta-analysis of the Effects of Meditation on Empathy, Compassion, and Prosocial Behaviors
“Clinicians and meditation teachers should be aware that meditation can improve positive prosocial emotions and behaviors.”
Judging by the abstract, that paper is irrelevant:
It is about metta meditation, not insight meditation (or at least some other popular kind of meditation)
The supposed benefits are to the society and not to the individual undertaking the practice.
“Most control groups were wait-list or no-treatment”