They were in the midst of a custody battle over Hanna's daughter, S. They wanted to take her away from her mother and grandparents. That's not friendly.
If you're thinking more in terms of them being frenemies, I don't pick that up in the relationship, either. Hanna was moving on, didn't want to be in a relationship anymore with JW. That was a good thing, considering his having sex with her at age 14 could be considered statutory rape. She wasn't mature enough to consent to an adult sexual relationship. He was controlling and according to some reports, stalker-ish. It was a positive thing for Hanna that she was finally breaking free of his control of her life and that of his mother.
These people's lives had value and meaning, regardless of their poverty. They deserved to live, not die. They deserve respect in death, not to be regarded as if they were a bunch of people who couldn't tell their friends from their enemies or had no right to control their own lives and futures.