However, on the flip side of that same coin, I do believe that he also was sending a message to Tom, Neri and Rocco in saying what he did in their presence about wiping out all of his enemies. Letting them know that if he even suspected anyone, including them, or anyone in their regimes, of planning to overthrow him or take him out, he'd wipe them out just for thinking it.
I agree with you DC.
Furthermore, Michael's statement that anyone can be killed was also a warning to his lieutentants that he would find a way to get to them if they turned on him.
Also, just before that meeting, a Senate committee had a witness who signed a sworn statement that he killed on Michael's orders. Despite that, the committee ended up publicly embarassed and humiliated. Michael may have felt that, even if Rocco was captured and turned on him, the authorities would be hesitant to attempt to implicate Michael again based on witness testimony.
