Old traditions worked this out a long time ago: someone who cannot be certain they are right cannot be righteously cruel. Doubt is not weakness here, it is what keeps the hand down.

What the research says

In a randomised controlled trial, a treatment built around training attention, drawing on mindfulness based cognitive therapy and dialectical behaviour therapy, reduced aggression and improved anger coping in autistic school aged children. Approaches that work on how thoughts are held, rather than on who was right, do move aggression. That trial was with a specific group of children and does not transfer wholesale to adults.

Strength of evidence: one line of research. A single study, or a theoretical account.