I know there's another thread on this, but it seems to be undergoing a thread drift right now.
With regard to the Assistant DA who was shot a few months ago, and the elected District Attorney who was recently shot, I don't think it's from either drug cartels or an established Aryan Brotherhood group.
I was an assistant DA in Tarrant County, not too far west of Kaufman County, then a defense attorney that occasionally had cases in Kaufman. In fact, I delt with the D.A. who was shot.
I don't think it was Mexican cartels declaring war on Texas prosecutors. Kaufan is way too far north, and is not a hotbed of activity for the cartels there. It's a small town and a minor county. Likewise, most organized criminal organizations steer clear of shooting cops or prosecutors, as they know what kind of heat it will bring down on 'em. It just isn't worth the trouble.
More likey something local.