I have concerns about WM as a role model given his lifestyle choices (alcohol problems).
I think DM's parents planned a rather rigid path for him...they were determined for him to have a career in aviation and DM never got to back away from that. He described himself as "an extension of another life". DM's parents had him go to prep school, no doubt with the intent that he carry on to university, because a degree is necessary to get ahead in today's competitive aviation industry. DM seemed to balk at this.
DM obviously did not respect his father if DM chose to kill him.
There was definitely something going on with his upbringing, IMO, and I think there was some tension brewing out of the enmeshed, rigid path that DM's parents built and DM's resentment of his father.
The reason boys choose to live with their alcoholic dad is so they can do whatever they want. He could do donuts in the middle of an upscale neighbourhood. His dad is too pickled to pay attention. He was a big kid, and someone described him as a screamer. He can just kick up a loud scary fuss and you just let his dad deal with it. Or not. I would bet it was rare that anyone ever managed to get him to do anything he didn't want to do.