Both Dunn and his son had some legal issues in the past, too, if I heard correctly on the jailhouse visit video. I'm not sure why TS would be considered a bad influence because people do make mistakes. Dunn for DUI and he would still drink and drive. We know he did drink at the wedding and drove afterwards even though he says he never does that.
Is it possible that Dunn mistakenly thought JD's door was opened when it was, in fact, Tommy's door that was opened. Or that the word "killer" which was in the rap song was being sung by TS as he entered the car (TS did say he was dancing before entering the car so was he singing, too). What MD might have heard was a car door open (by TS) and he assumed it was JD and he heard "killer" and assumed it was JD saying it. It is possible. We know by Dunn's own admission that he could not open his door because he was parked too close to the SUV but wants us to believe JD fully opened his door and got out. Is it also possible with the lighting at the Gate that what MD thought was a gun barrel was actually light bouncing off of JD's cell phone since cell phones are about 4 inches in length?
Could this have happened because MD was drinking and did not process what was actually happening and was only focused on the fact that JD was being disrespectful and panicked when he heard a door open? jmo