I've never tested as anything but INTP. Sometimes my F is higher on some tests than others, but I'm definitely a T. Martoon's post could have been my own. I have a desire to treat others (and animals) kindly, so that probably figures in.
"I can never be what I ought to be until you are what you ought to be. You can never be what you ought to be until I am what I ought to be. This is the interrelated structure of reality." -Martin Luther King, Jr.