The whole idea of the suicide was Frankie's way to restore his honor. By doing this he would be viewed as having died for the family and the Family would make sure his widow and children etc would be taken care of .

"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"

"I stood in the courtroom like a fool."

"I am Constanza: Lord of the idiots."