Some say that Nature is cruel. However, if you watch Nature, she does many acts of kindness.
Some say Humans are cruel. If you watch them, you will see humans do many acts of kindness.
Kindness is recognizing that someone or something needs help of some kind, and then stepping in to quietly provide that help, and then stepping away.
It is not a kindness to do something for someone, and then hold it over their head.