I'm not sure if this is significant, and I don't know if I can state it well. Feel free to comment to make my points more clear / less offensive / etc.
I am from the Wiregrass but not Ozark specifically, although I'm familiar with the area. This is the deep, deep South, and there is a long history of racial inequality. We have come a long way since Jim Crow and the Civil Rights movement, but racism still exists. It is most often subtle but there are pockets of subculture in which it is more blatant and even vicious. There is a commenter on some of the old threads on other sites (V) who has been mentioned here. He claims to have known JB well. He also has some pretty bizarre ideas about race as it relates to his religious beliefs (google "Christian identity" to learn more). This suggests to me that JB was at least acquainted with someone, possibly multiple people, who held ardent beliefs about white supremacy / racial purity. (I've never seen any indication that either she or Tracy believed anything like that.)
We also know that:
1) JB and Tracy had black friends. One of the people who talked with them on the night of the murder was an African-American young man called Bookie. They were seen talking with him in a friendly way in a public place in Headland.
2) JB's legal guardian was her dance instructor (P), who is well-known (and loved) in this area. She would not have tolerated any racist nonsense in her home or her studio. I am somewhat familiar with her work (see my screen name), and I saw a piece that she choreographed to Dr. King's "I Have a Dream" speech which moved me to tears. In promotional materials for another stage production with which she was affiliated, she stated, "As a mother of white sons and black sons, I feel that this is a story that needs to be told." (This may not be a exact quote, as it's from my memory.)
3) The last people known to have seen the girls alive were the ladies at the gas station. Didn't Jacqui say in her interview that they were African-American?
This may not be related to the murders at all. But if JB had friends / acquaintances affiliated with this "Christian identity" way of thought, they may have been highly upset by these things, particularly her spending time in P's home. Didn't V live near the area where the car was found? (Or was it that he had friends who lived near there?) At any rate, if they ran into or even stopped to visit someone in this group of acquaintances on the night of the murder, couldn't this have led to an argument?
This seems a bit far-fetched, I know, but I was really struck by some of the racially charged things that I read on some older sites, and I haven't been able to get it off my mind. Thoughts?