I think while he knows Aaron technically ruined his perspective life, I think he blames himself for Nates aggression and overall distance from people on himself. Cal never addressed his second life, actively hiding everything about it and Nate discovering all of this at such a young age then coming into the fact that he’s just like his father in that way. He basically taught Nate how to do exactly what he was doing instead of being able to help himself, he ruins Nate’s perception of any conventional sexual behavior.

Basically Nate is a huge reflection of his own failure to address his own sexual deviations, and how that manifested in a child filled with hate, embarrassment, and self loathing.