This is my main theory too. I think someone is going around the area robbing and executing drug dealers. I'll bet they'll strike again too.
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Yeah I mean I'm leaning more towards a user than a justice thing. Dope heads (pills are the same thing) need their fix so it's not uncommon to have different networks or avenues to obtain drugs. So all these different dead people didn't even have to know each other or have any connections if the common denominator is a user. 2 users (suspects) could have 2 different networks, so one knows this location this one knows that location and they work together. Likely targeting larger opportunities. So looking from the outside it may not appear they are connected other than style. Unless LE was watching each location for activity or everyone was logging names of who they are selling drugs to, I feel like it be hard to connect someone to all 3 positively without DNA prints or something. Which I'm assuming they don't have. I'd also assume murder weapons don't match though, and I'm pretty sure the FBI would certainly take lead if it went to multiple states.
I guess there could be a kind of copycat deal too but doubt it.