#sorry i'm just summarizing and condensing the points from my own posts from the other day

[angelsdean]

cas asks dean (and sam) about john in 10x09 to get a better understanding of what a father should do re: claire's situation (bc he says he never knew his father). dean, imo, embellishes and says john was always "there when [they] needed him." sam then prompts dean to tell a seemingly "funny" story abt a time john swooped in to save dean. cas then parallels this moment when he barges in to save claire from the men that were attempting to assault her and traffic her. dean, with his own past experience fresh on his mind--and perhaps letting himself acknowledge what almost happened to him (and my own belief that john didn't actually magically show up to play hero but in fact let dean sneak out to teach him a "lesson")--decides to take things a step further. it's not enough to just save claire from these men, they need to be eliminated, so they can't do this to anyone else again.