It's an effective strategy I agree. The only downside to it for the Mob is that, at some point, it may encourage made guys to take more risks and stop respecting some key rules because they no longer fear a death sentence.

If the punishment is not too harsh, then people will naturally try to cross some of the Mob red lines.

That is why I believe, we'll soon see one or two mob murders which would serve as a wake up call to everybody.