I think it actually does make sense. If not love- at least respect I would say. Someone who feels no worth, no respect, no love for themselves I imagine will be more likely to tolerate abuse from others- because they don't think they deserve better. Also- constantly seeking validation from another person may end up being exhausting and irritating for them. Plus, I imagine it could well lead to co-dependence on another which could end disasterously if they leave or, if they are abusive/manipulative.
I think having love for yourself (obviously not a narcissistic, excessive amount) is simply a defense mechanism. It hopefully makes you less willing to be abused by others and it also means you can be self sufficient emotionally to some extent.
In terms of how to achieve it though... It's probably harder if you haven't had it instilled in childhood I imagine. My upbringing was strict but very loving. I was taught to respect myself. That I had rights, as much as everyone else.
I think probably forgiveness is a big thing. So many people here say they hate themselves. Which is so sad. I think maybe we've all acted in ways we feel ashamed of at some point. But, I think it's important to analyse why we reacted like that. Was it a defensive response? Why have we turned out the way we have? Was there abuse or neglect or abandonment in childhood? We couldn't help those things. So- I think that's one way of feeling more compassion towards yourself. Kind of to feel sorry for that person at that point but also be mindful of how it influences the person you are now and- if you don't like that person, I suppose think more before you act.
Weirdly though, I think hating what you have become is in a way, a form of self love. It's an acknowledgement that you could and should have become other than you are. That suggests an underlying knowledge of self worth to me. I'd say self worth is similar to self love. Self love I think is about being your own (loving, caring) parental/ teacher/ coach so you can sustain yourself in the rough patches.