(no subject)
I'll show you mine, if you show me yours...
(comment to be added)
In the long term scope of things, kindness is never regrettable. In certain situations it might also require sacrifice in order to see the kindness come to a positive outcome. This is not weakness, but great strength.
Anger (fear), violence, aggression, dishonesty, these things are clear weaknesses and lead to themselves in the end.
Kindness is certainly a virtue. I think it is a greater virtue when done for the benefit of others, rather than for some (often unconscious) hope for a reward in return. I don't think that self serving kindness is really much of a virtue..