They may take advantage of us. Showing kindness can get you dirtied. Showing kindness can also hurt. Someone at work makes a snide remark about a coworker of a different racial background and turns that into a cutting joke. For Christian kindness goes deeper than the initial response.
Christian kindness is tied, for a start, to Christian love.
And love sometimes demands tough action in order to get what is honestly a good result, a healthy result, an upbuilding result, a life-enriching result. An act that prevents a person from confronting the true damage that is occuring as a result of their alcoholism is not kindness. An act that results in a pregnant teenage girl and a young boy who is encouraged in promiscuity is NOT kindness. An act that allows one person to demean another and go unchallenged is NOT kindness. Kindness is that inner response to do good to another, to help a person experience something right or upbuilding or positive in her life.