The following is from the Godfather movie:
The Don: I forgot the vengeance of my son. But I have selfish reasons. My youngest son was supposed to leave this country because of this Sollozzo bussiness. And I have to make arrangements to bring him back here safely. Cleared of all these false charges. But I'm a superstitious man. If an unlucky accident should befall him, r if he should be shot by a police officer, or if he should hang himself in his jail ceil, or if he struck by a bolt of lightning. Then I'm going to blame of the people in his room and that I do not forgive. But, that aside let me say that I swear onthe souls of my gradchildreans that I will not be the who break the peace we've made here today.
What does that aside mean here?