Ben
**spoilers**
To me, Ben is the most sympathetic character.
Sure, he had bad judgment in choosing his friends,
but he didn't kill anyone the night of the murders and several times stopped the girl he was with from choking his sister.
Then he goes to jail for 28 years because his sister lied and out of a sense of loyalty to his girlfriend and daughter (questionable or not he did it out of loyalty).
Ben is not responsible for the events that set in motion the paid hitman to kill his mother and sister.
And given the chaos of that night, he's mostly not responsible for his friend killing his sister; except for the fact that
he let the girl in his house to begin with.
So, in one of the final scenes when Ben says he's sorry to Libby, I'm thinking man, she should be apologizing to her brother for telling the lie that sent him to prison for 28 years while she wallowed in self pity on the outside all this time. And she has the audacity to say well we each told a lie so that makes us even. Yeah, except your lie, Libby, sent your innocent brother to prison for almost three decades!