Clearly this behavior was one of his mistakes.
With that said I don’t buy into they didn’t kill him because of the camera’s.
There weren’t many camera’s back then.

Why didn’t they kill Sammy then, why didn’t they kill Jr. then he was open game when he was involved in the life.

As for the guys they killed they were sneak attacks.
Casso knew very well the Gambino’s Gotti’s best friend tried to kill him, why didn’t Casso go after Angelo and atleast take a shot at him.

The only answer is they were afraid to go after the Gambino family head on, even the two families together.