People forget Simon can't shut up when he's stressed out. He was straight-up monologuing to a completely silent Eel just to self-soothe down there in the Lung.
Simon wouldn't get into the atrocities he did, but he'll mope about the state of things, about the bigger picture, and about other people. He'll talk about memories and do everything possible to lament on happy times.
But he won't admit he's just as bad of a man as everyone else.
He won't talk when he thinks the person asking will hold it over his head. That's only fair. Simon's ready for everyone around him to be a bully, because we all saw what the COI did to Simon when he believed in them enough to surrender.
Simon's a talker. Most of the lines in the entire movie are Simon just yapping to himself.
Just an observation I made from the movie while challenging some common fandom tropes!
