Greetings!
Y'know, I realize this is Im_a's thread, but I really feel compelled to address this particular post. I feel some things are not being made clear, that any misunderstandings are unnecessary, and there are a number of "seeds" to the right answers right here in your post, Brinny. I realize some of this is out-of-order with your original post, so please bear with me, and I apologize in advance if I cause any confusion.
I find your reference to a "hammer" and "nail" most interesting. Have you ever heard of "Maslow's Hammer?" It refers to a person's approach, or ability to approach, problems in life. The concept originates from the quote, "If the only tool you have is a hammer, you tend to treat all problems as nails."
I believe that this is what Eudaimonist is alluding to when he is referring to each person's worldview. The worldview of any given person is the "tool" that person uses to approach problems. But in truth, not every problem a person faces is a "nail."
You then go on to come within a hair's breadth of answering your own question:
empathizing, weeping with someone has nothing to do with beliefs or world view or philosophy.....it has everything to do with feeling for a fellow human being...
On this I couldn't possibly agree with you more, but what you seem to not understand or recognize is that very few people are capable of true, honest empathy. And while the ability to empathize has nothing to do with worldview or philosophy, in the absence of that empathy, the latter two is all a person has with which to work. At that point, yes, worldview would have to be at least somewhat compatible between two people, otherwise one would be basically trying to install a "lag bolt" with a "hammer." Oh, it can be done, but not without causing some amount of damage.
Also, I understand what Eudaimonist is talking about here:
Eudaimonist said:
I would try, in order to grasp at the right words. However, this would be a problem -- because sincerity would be difficult when speaking about things I don't believe in. I think that this would undermine my attempt.
I agree with him fully. If he was unable to either relate or empathize with a person, a false or insincere empathy would do little good, and possibly even more harm. And besides, Eudaimonist is most certainly not the type of person to be intellectually or spiritually dishonest.
Lastly, I have to tell you, especially with your reference to the late, great, Mr. Buscaglia, that while love, a true and honest love, is a wonderful and powerful tool for helping people, it is not infallible. I've known many kind, loving, and talented counselors in my lifetime, and none of them have a perfect success rate. Nor do *they* know of someone with a perfect success rate. So, if even those among the best cannot "reach" everyone, how much moreso for the untrained and/or untalented? Among these counselors, it is understood that there will always be those few people who don't want to be "reached." At that point, it's up to the counselor to accept that even with all the love possible, the best intentions, best resources, and best ability, you simply cannot save a person from themselves.
Warmest regards,

-- Druweid