Hey!
It's rather late here, I just finished the entire experience and really like your post, I will add more of my opinion later on (probably tomorrow!)
Anyways, I'm not sure if you are talking about loving/hating them as characters (how they were written) or people, with lives (obviously not real, but as if they were). But, I'll assume you are talking about how you see them as people.
I want to love them all, I know, it sounds cheesy. I used to be like this several years ago, I wanted to understand everyone, see why they were angry, why they yelled at people; I always felt that somewhere beyond their anger was something that was still... Innocent?
Well during my undergraduate years (and bear with me this all relates to your question), I had a female friend of 5 years. During all this I had my GF of 5 years; anyways this female friend, "Leen", opened up to me one day and I learned that she had a lot of issues (being cheated on by her first boyfriend, losing a lot of friends, it goes on), she was a funny person, usually happy, but people didn't like her for a reason. Basically, even though a bunch of people hated her for some reason I still felt bad for her and tried to connect more... Well it totally fucked me over and she called the schools police on me for "stalking" her for months (which is why I brought up my girlfriend, because I am always there for her first and would never stalk someone...). I was accused and everyone at school, my best friends, everyone stopped talking to me at the LAST year of college.
Basically, even after all this, trying to understand everyone's issues and then getting majorly screwed over by it, I still want to be that person that cares about everyone.
So back to your question, I want to understand everyone, and I really tried to, I went through every conversation in the entire game. I want to understand why Jefferson became that way, because if Frank isn't so bad, if Nathan had issue because of his fathers, then Jefferson even had issues somehow growing up. It doesn't mean I love who he is now, but I do love him as a human being.