Viewers get a taste of the underlying anger that John is capable of in episode 4 when he fights the god Neto and doesn’t hold back in killing him. His quickness to want to kill Tony in episode 5 is also indicative of John wanting to lose himself in violence to forget his trauma and PTSD.
As John was that ruthless and full of rage when faced with the deaths of a war veteran he didn’t know and a politician, one can only imagine how he was following . With that context, it’s easy to see how this trait was passed on to Dean. It wasn’t necessarily an inherited gene, but more of a learned trait Dean picked up after spending years hunting with his father.
One of Dean’s favorite pastimes was working on his 1967 Chevy Impala, Baby, to relieve stress. Dean even rebuilt Baby multiple times, most notably at the beginning of season 2 and after
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