“But the movie prefers to exist by the credo that anyone can be killed without consequences, or rather that the consequences will always be favorable for the killers.”
I guess it depends on what you want from your consequences. Many of the killings take place because of a tit for tat war between the families predicated on deaths attempted or otherwise. Do people go to jail? No. And through these murders Michael (and his family) become more powerful than ever, at the expense of Michael’s relationships with those closest to him.