Not necessarily. Caring genuinely about a client's welfare is probably enough on their end. I suspect it is the clients that get hung up on the "love" aspect, not the therapists for the most part. Love may be a bit of a strong term to be used as an absolute "must" or "it won't work". I do think people in caring professions actually need to care, but that may come short of actual "love" feelings (and no, I'm not talking about romantic feelings).