Can you love a sociopath, unconditionally? Only 4% of the population qualifies, according to a book I just read, The Sociopath Next Door (so sorry, author's name not coming to me). They play on your sympathy, and they have no conscience. They don't "grow" a conscience, either -- they are generally just scheming a new way to manipulate. The book really made me question the idea of unconditional love. I'm not sure who could love these people, really. They can be pitied from afar, but up close and in your life, they will wreak havoc.
However, I do believe it's a worthy endeavor with the other 96% of the world!