DT, when Michael is hugging Fredo and looks over at Neri, Neri looks down as if he's almost embarrassed by the implication in Michael's look. Fratricide under any circumstances would be something that even a hitman would find exceptional.
As far as Fredo not being a bumbling idiot, the film and novel pretty much portray him as such.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
