A Fine Line?

So there's an old expression that goes 'there's a fine line between love and hate'. I googled it and found some discussion boards, which had some varied responses on the matter. Some people felt there was a fine line between love and like, or dislike and hate, but a large distance between love and hate.

Now, I do believe there's times when we can hate someone without the love component. For example, if, hypothetically speaking, someone were to hit my car and drive away without leaving a note, I would hate that person, but there would be no love to it. That, and I do believe we can hate someone like a coworker or a friend's boyfriend without the fine line. Although, this might be more of a strong dislike than a hate, depending on the situation.

The bottom line, though, is that a person has to CARE to hate someone. However, when it comes to people we at one point cared about - say, a family member, a friend, or a former lover - I do believe this statement rings true loud and clear. Indifference is the opposite of love (and hate, I suppose). I think it's the case for pretty much everyone we hate that we at one point in our lives didn't. I can definitely think of some examples in my own life.

Now, granted, I think that, with most of these people, my hate/dislike for them is legitimate - they betrayed/disappointment me in some way, and that's the basis for it - not just bitterness, as some would infer. However, I think the fact that I cared for them at one point is really what it's about. I think this is where my passionate hatreds lie (not that I have many). If someone you don't expect much from in the first place screws you, there's no shock factor to it, therefore there's no time wasted wondering 'Is there something I did to deserve this? Is there something I could have done differently? How was I so foolish? If only I would have....'

Anyhow. Your thoughts? Is there a fine line between love and hate? Agree or disagree?