It seems to me that as people age, they have the potential to become more wise. Yet, why does senseless harm continue for people even when they get older?
You already have hinted at your answer by using the word “potential.” Having potential does not mean that the person realizes and appropriates more gentleness, mercy, and love. These need to be consciously chosen, with correct understanding of what these are, and the continual practice of these so that the person grows in greater proficiency of them. If communities do not emphasize gentleness, mercy, and love, then people may not reflect deeply on them or practice them diligently, thus losing the opportunity for planting these more deeply in families and communities. Surely, this is a great opportunity lost. It is time to put gentleness, mercy, and love more consistently on the table for discussion and implementation.