No idea if this has been mentioned already, but seeing Cable and Rachel interact, and treat each other almost like siblings, was interesting.
But seeing them refer to Jean and Scott as 'mom' and 'dad,' that felt odd, and, IMO, not organic-to-the-characters. (Granted, I know literally nothing about 'Kid Cable,' so maybe this is totally in-character for him. But Rachel calling Jean 'mom?' Just kind of surreal, to me. I think she's at the point where calling Scott 'dad' half-affectionately and half-sarcastically, but she and Jean have had less bonding time, it seems, between Jean being dead at times, and Rachel mysteriously off-panel much of the time since Jean's return.)
That's kinda what I was thinking there. He sees himself as having evolved past that old philosophy, and now, as Warren foreshadowed about regrets and sins coming home to roost, his old way of thinking is biting him in the ass, hard. He was so so sure of himself, and he passed that on to his kids, who are just as unforgiving as he would have been, back in the day, to someone who abandoned their rigid view of might-makes-right.
The foreshadowing from Warren just hangs the lampshade for all to see. He might as well have been narrating the deeper meaning of that upcoming betrayal.